GRISO MPG

[double.d]

Aldi wrote:

Sorry, double d, no offence intended. You didn't tell us how you arrived at 4.8l/100km.

Absolutely no offence taken . I arrived at that figure from what the readout tells me. I forgot to check, but i have done a little calculation based on some facts i know about my Griso.
100klm = 62 miles and 4.55ltr = 1 gallon.
I know that my fuel warning light comes on with 6 litres left instead of 3. This happened this past weekend with 220klm on the trip metre.
So based on this info it would seem that i did 136.4 miles for 2.41 gallons, which when broken down comes to 56.59 mpg:huh: ,which i doubt is accurate.
In the past i have gone 270klm on 16 ltr of fuel, or 167.4 miles for 3.51 gallons, which when broken down comes to 47.69 mpg. This i believe is more accurate.
:unsure: :unsure: :unsure: Stuff it, this has got me going now. i will definately check that readout tonight.

 

[double.d]

So i checked the dash readout and it sais that on my little weekend jaunt i got 5.2lt/100klm,(only a little fib on what i first reported , but i have got 4.8 in the past) or 1.14gal/62miles, which equates back to 54.38 miles per gallon:woohoo:

 

[Spaceclam]

when my bike was new, it got 26.

after the breakin service, it got about 29, and slowly creeped up to 32.

Between about 3500 and 4000, my mileage shot up to almost 40.

Everyone has told me about the long guzzi breakin, but i never really felt anything change or get way better, like everyone promised, so i had kind of put it off as myth. But suddenly, at 4k miles, i can say it cold starts way better, gets better mileage, and throttles much nicer.

 

[Mudcat88k]

It looks like this thread is dead, or in deep hibernation but I'd like to make some comments. My 8v Griso only has about 1600 miles on it, and it has gotten only 26 to 28 mpg, assuming the odometer and gas pumps are accurate. In other words, I have to fill up about every 80 miles with about 3 gals. At 66 yrs, I ride like an old man (I'm old for my age), and only occasionally run through the gears with lots of throttle. I can hardly believe mileage could be so poor without seriously flogging the bike. I even get 20-21 mpg in my 7000# diesel pickup truck at highway speeds. I don't care so much about the gas mileage, but I really hate having to stop for gas so often, and a bigger tank is not an option. I didn't see any improvement after the first service, which included the camshaft/lifter change. I'm anxious to see the improvement others of you notice after another 2500 miles or so. I run 93 Octane with 10% Ethanol, and experience no pinging, but I am very unhappy with the poor running at low rpm and the exhaust popping on closed-throttle deceleration. I briefly rode a Griso 1100, and ran like a Swiss watch compared to my 1200, and it had around 2500 miles.

 

[YBFAST]

and only occasionally run through the gears with lots of throttle. I can hardly believe mileage could be so poor without seriously flogging the bike. I'm anxious to see the improvement others of you notice after another 2500 miles or so. I run 93 Octane with 10% Ethanol, and experience no pinging, but I am very unhappy with the poor running at low rpm and the exhaust popping on closed-throttle deceleration. I briefly rode a Griso 1100, and ran like a Swiss watch compared to my 1200, and it had around 2500 miles.

Hey Mudcat,
I know it seems counter intuitive... but...My 1100 gained considerably in mpg when I quit babying the throttle! IMHO The Guzzi design really does run better when allowed to break in and run at a higher RPM. The mapping at lower rpms just doesn't seem efficient. I speculate that the overly lean condition at low throttle openings (note the popping etc) is so inefficient that net result is a boring ride and poor fuel consumption. Now well broken in and ridden a little more aggressively, I seldom drop below 40mpg.
Of course, a lot of this may be due the Gris being broken in and a few simple mods (see other posts for cannectomy and bedding the engine temp sensor in heat mastic)

Hang in there and get to know the bike. I'm sure it'll treat you right a you get to know each other!

 

[rocketman]

I am happy with my Griso 1100's MPG. The bike now has 4k on it and I consistently get 40-43 mpg (US). Some city, but mostly country roads, with periodic neck wringings (these babies like to stretch their legs). 55 to 75 mph, with occasional spurts up to 80-90-100. I got 45 mpg from my last tank which was all highway miles (193 miles). I am really happy with the gearing of the Griso. Prior to getting mine I was concerned, based on what I had read, that it may be geared too low. But my experience so far tells me it's geared just right for a naked bike. I find that I use 5th gear most of the time. Works for cruising between 55 and 70. 4-5K is the sweet spot. 6th gear at 75-80 mph is perfect. I'm getting the PC-V, Autotune, ECU reflash combo from Todd and I hope my mpg doesn't go in the tank after the mod. If it does, I will have the option of building a leaner map for touring.

 

[Ghost_Bullet]

From the last few fills this is the results I have had over a 3 day weekend and doing over 1800km, I am pretty happy with the performance.



39.49
47.98
46.64
45.33
43.97
45.05
44.19
49.60
46.66

 

[rturo]

I'm impressed with you guys measuring and recording ... my Breva 1100 averages 40-44mpg on the display (US I know) running 99RON in the UK and I've never had the patience to brim it full as the last half gallon seems to take about 10 stop/wait/starts because of the fuel nozzle constantly detecting full and switching off. I'd like to know the true figure but cant be bothered recording all the fuel added over a decent number of fills then doing the calculations.

I discovered (for scientific purposes :idea that it will display mid 20s MPG at 90-95mph into a strong headwind. Bonus of a being a big old heavy thing is that it still has rock solid handling in these conditions.

BTW - my TOMTOM reads 93mph at a Guzzi displayed 100mph (tyres at standard pressures, less than 50% wear)

 

[Will]

I've now done about 3000 miles of mixed roads & speeds on my 8v.....everything from long fast motorway cruising thru' twisty blasts to a funeral escort. Result calculated from my notes indicates about 42 miles per proper full size UK gallon or just over 9 miles per litre. Don't ask about kilometres per litre.....my infantile mathematical brain is boiling over from excessive calculus already! I get a gut instinct that it's improving as the bike is run in.....although my extensive record keeping (stubby pencil & grubby scrap of paper) cannot provide exact proof: I failed miserably to note what style of riding occured when.....all I know is I enjoyed every fluid ounce of which ever grade of fuel I used.......except perhaps for when I was coasting desperately in search of a fuel supply miles from nowhere & faced with 'The Long Push' that I fortunately never had to make!

 

[easyeric601]

With highway riding my light comes on at ~165 miles, city ~140. It usually takes 3.4-3.5 US gallons. Figure 47 highway, 40 city for me.

 

[SMChris]

I just installed the PC-V and Autotune ( more on that when I have a chance to ride a bit more, but to summarize it's GREAT). But my question for this thread is related to mileage. I don't know what the new setup will do for mileage, but my question is what affect the PC-V has on the estimated mileage shown on the display. My guess is that the PC-V is making corrections that the ECU doesn't know about, therefore the estimated MPG will be off by whatever amount the PC corrects for (+ or -). Is the ECU calculating the estimated MPG based on the signals it sends out to the injectors, or is there some other type of fuel flow sensor taking actual readings?

 

[GTM®]

I just installed the PC-V and Autotune... Is the ECU calculating the estimated MPG based on the signals it sends out to the injectors, or is there some other type of fuel flow sensor taking actual readings?

The ECU is calculating based on rpm/mph/throttle position via ECU. WIth the PC-V, it won't be accurate... but I'll be curious to hear how far off it ranges.

 

[GuzziMoto]

As mine was pessimistic before, typically reading about 2 or 3 mpg less then actual it might actually improve and be more accurate. I will try to track and post what I find but as of yet I have not gotten to ride the bike since the install (supermoto and shooting guns instead). The install, by the way, went like butter for me. I like those posi-tap things, never used one before but had seen them. And I thought ahead and ground the paint off the spot I used as a ground. My only issue was the adhesive backing on the velcro did not want to stick. But the rest of it went great. I hope to ride up to Europa Macchina this Sat on it as I hear they have quite a few things worth checking out including a V7 Classic (wife wants one pretty bad) and a couple vintage Guzzi singles. Anyone in the mid-atlantic area really should check them out.

 

[Ghost_Bullet]

My Griso from new, 2006.
Last year I had a fault with my ecu pics on this thread linked https://www.guzzitech.com/forum/163/4310.html
My first year or running I averaged around 15.9km/litre.
2nd year 17.9, 3rd year 17.6. This is through summer and winter. I made a trip last weekend, where the bike averaged 15.09km/litre. The dash was telling me some crazy poor figures, which reminded me of when the bike was running on one cylinder just prior to my ecu failure, but that instance I had intermitant warnings "SERVICE" from the dash.

This time around I am jusy not sure of the issue. I had shop services at 10-20-30 and 40k. As well as the run in services. I did fluid change and outer plugs at 50k myself along with an overall check of things. Nearing 60k now and likely to go for a shop service.

but interested in any info from anyone. I did purchase a second hand ecu, but sadly it was destroyed in the postage system, I have a second hand loom just waiting, but ecu's are like hens teeth, unless you want to pay factory price, and that I do not.

 

[Mark111]

Guys
I recently picked up an 8v Griso an ex dealer Demo? (it was one of the dealer owner's toys) with about 1100km on the speedo. This is an 08 model and like brand new and does not appear to have been subject to any of the recalls (I came across a list of id numbers of the affected bikes on one of the Guzzi websites but have since lost the link).
My fuel consumption wasn't great initially but after a further couple of thousand km's has improved significantly 5.5l per 100km (50 mpg imperial) verified at the bowser. My riding has been fairly conservative as I am just getting back into bikes again after a long period away (kids, school fees, mortgage).
The bike has a Staintune muffler and seems to be pretty much spot on tune wise, sounds great, but a few times when I have been in stop start traffic it has seemed to load up with excess fuel at idle and misfire until I rev it and clear it out. This has only happened a couple of times and has been more of nuisance than a major problem. Has anyone else experienced this and does anyone have any thoughts on a solution. Apart from these couple of instances the idle and general performance would seem to indicate it is setup fairly well and I am reluctant to undertake any major surgery as it is overall a fairly minor inconvenience.

 

[GuzziMoto]

Make sure the basics are done correct, valves, TPS, etc. Also, make sure it has the most recent map. I would not assume that it does. After the newest map is installed the TPS needs to be reset I believe.
Beyond the basics, without dropping a fair chunk of change on a PC-V kit from Todd you can't adjust the fueling.

 

[Belfastguzzi]

Guys
8v Griso
50 mpg imperial

You should be delighted with that! It seems incredible to me. My 8V has always given terrible mileage, particularly after it had 'dealer services'. I was getting from 17mpg to 27mpg.
Now that I'm finished with dealers and have set-it-up myself, the bike is running much better and I'm pleased to be seeing 35mpg on good trips.

I've held back from replying to recent mpg threads on forums, but am replying now just because I've compared the bike with a car of similar capacity. I'm back from a trip across Ireland and down the west coast (so very varied road conditions) with 2 of us in a VW Polo, petrol. The previous weekend I happened to do a similar ride on the Griso, over many of the same roads.

Solo Griso gave 35mpg (great return compared to what I'm used to)
The Polo gave over 66mpg (imperial).

OK, big twins are thirsty and the bike was going a lot faster than the car, but the car was still being pushed hard too.
It's mad.

EDIT. I must check the bike figures. I may not have worked it out from actual consumption. I think that it's from the display. I know I had a look during the trip and was pleased that it was staying up around the 30+ on the dash: which as I say, was notable as it was better than I had been used too. I wasn't that bothered about working out the actual mileage as I'm resigned to the thirst - so I don't think that I did do it.
I did do the car mileage properly: so it's correct.
I will check on the bike and post back. Perhaps I've moved into the 40mpg (imperial) area, for longer trips!

 

[Trogladyte]

I'm amazed at some of these figures. My 8v has dome about 10k miles. I ride enthusiastically, and almost always on London streets. I'm lucky if I get to 70 milesbefore I fill up, and the clocks usually claim somthing like 26mpg. With today's fuel prices that's pretty grim, and way thirstier than my car.

 

[grimace]

I just got a 2010 red. Put about 250 miles on it so far. Couldn't find much info on the low fuel light. Mine comes on around 70-80 miles. I've put in about 2.3 gallons. Does the light blink when extremely low? Does the light get better/more accurate with age? I also have another piaggio product a vespa 300. The engine livened up around 3500miles and the fuel light kicked in much later. Is this true for the griso as well?

 

[cyclobutch]

My G11 has done around 8k miles now. I always fill with the highest octane rating fuel I can find on the forecourt. I only use it in Summer and it's all mostly open road work. The riding will vary between fast touring and faster work running up to 7k rpm or more through the gears. It used to do around 10 miles per litre, it's now more like 11/12 per litre regardless of how I ride it. The light comes on around 130/135 miles. The dash is showing miles per American gallon remember.