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RPM sweet spot & Fuel Consumption

C

Chadlebowski

Cruisin' Guzzisti
Joined
Jul 28, 2015
Messages
149
Location
West Sussex; UK
Hi! I'm after some opinions\technical expertise with regards to an ideal rev range? Also, although I appreciate that the whole point in the bike is often just to be able to burn fuel with reckless abandon, but for the more frugal moments, any tips for squeezing as many miles as possible out of my 14l tank?
 
its and 18 Litre tank, I ride much the same and over 30000 miles have averaged 43mpg (UK gallons), the dash mpg output is in US gallons, so you need to add 20% to that. I run to 150 miles on tank before getting worried about refueling, but have run dry 3 times - the Stelvio is a heavy bike to push for any distance.
Lots of info on here about fueling (Todd's PCV5 and ECU flash sorts it all out).
I ride in the higher gears, 70 mph = 4000 rpm which is unfortunately the flat spot in stock set ups. I find that the high gears can chug along happily and hence limit fuel burn, obviously this reduces you ability in accelerating quickly.
All depends on how you ride.
 
Chadlebowski said:
Hi! I'm after some opinions\technical expertise with regards to an ideal rev range? Also, although I appreciate that the whole point in the bike is often just to be able to burn fuel with reckless abandon, but for the more frugal moments, any tips for squeezing as many miles as possible out of my 14l tank?
Click to expand...

My Stelvio has Todd's PCV5/AT and ECU flash and riding in 3500/4000 rpm range it gets around 42 MPG.
Bob
 
Last edited:
I tend to cruise at about 80 which is about 4,600 on the gauge which I find is a comfortable cruising speed/rev in top. Bike is fitted with a GPR end can and Finebau compensator which has significantly reduced the hunting on part throttle and the popping on the overrun.
Recent 2,000 mile trip round spain gave about 46 to the gallon on long, constant speed, runs which means about 138 miles from fill up to reserve light comming on. Commuting reduces the consumption to about 40mpg
 
A few things that affect mileage...
Keeping the revs lower.
Keeping the speed lower.
Keeping the speed steady.
Accelerate more gradually.

There are more, but that is a start.
None of those things help with enjoyment.
I ride for fun and rarely follow those rules.
 
Hi - thanks for all the replies...

I appreciate that gradual acceleration and low revs might be more economical, but definitely not nearly as enjoyable.

What would you say about the added wind resistance from panniers? Or perhaps the wind-shield height?

Also - Paul_Tim what do you mean about "hunting on part-throttle". Am I right in thinking this is the sort of lurching sensation?

Lastly - can someone explain more about the ECU flash, and tell me if this will be transferrable to another stelvio should I ever get one?
 
Chadlebowski said:
Lastly - can someone explain more about the ECU flash, and tell me if this will be transferrable to another stelvio should I ever get one?
Click to expand...
Happy to answer questions direct email outside all of the info posted about it in the GT Products section. As long as they don't change ECU types, it is transferable.
 
Chadlebowski said:
Also - Paul_Tim what do you mean about "hunting on part-throttle". Am I right in thinking this is the sort of lurching sensation?
Click to expand...
Yes, trying to hold a steady speed (say 40) and a steady throttle the bike sort of lurches or hunts as the engine management system fails to react correctly, a classic problem on poorly programmed fuel injection systems. Reflash of the ECU is supposed to eliminate this (no personal experience) and a power commander or other 'add on' box may, or may not, help.
 
The bike is partial "closed loop," meaning it uses the stock narrow-band 02-sensor to keep the fueling as lean as required by Euro3 emission regs, at low speeds. It transitions from closed to open (static mapping) at about 3500 RPM, and one-third throttle. Pretty much where you find yourself the most. The stock sensor is simply a switch to notify the system if it is working or not. The stock system is not an adaptive one like people all-too-often think. The ECU flash mostly eliminates the 02-sensor input making it a fully static map. Adding the Power Commander and AutoTune from there makes it a fully dynamic system. More info here; https://www.guzzitech.com/forums/threads/guzzitech-power-commander-v-information.2686/
 
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