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What fuel to use in a 2013 V7

One thing that irks me is when the pump price for 89 octane is higher than the mean pump prices of 87 and 91 octane. I'm sometimes tempted to buy twice, fill the tank half full with 91 and then the other half with 87 in a separate charge transaction. If the dealer notices that he had to pay for 2 separate credit card transactions, maybe he would re-think the wisdom of charging more for mid-octane fuel than the mean of the high and low octane fuels.
 
sib said:
No reason why the mileage to differ, low and high octane fuels have the same energy content.
Click to expand...
Assuming the ECU is reading the fuel correctly (via a knock sensor or something), it will advance the spark for premium fuel. This will provide better mileage. However, you may or may not reap the benefits due to the higher cost for the fuel. High-priced premium and slightly better mileage or regular with slightly lower mileage?
 
"it will advance the spark for premium fuel."
Last time I posted that, someone corrected me.
If your engine is designed to run premium and you use premium, the ignition advance will be at stock setting.
If you run regular fuel, the advance may be retarded under certain conditions.

If your engine is designed for regular and you run premium, the ignition will not advance.

This is one of those recurring posts like "what is the best oil" Round and round we go with no real result.
Run the grade recommended by the manufacturer and if you get pinging or knocking, move up a grade until it's gone.
I have read that the ECU flash can cure this problem as well.

If you want ethanol free, that is usually only found in premium fuel so you need to determine if the ethanol is really causing any problem that makes the extra expense worth it.
 
Keith Broughton said:
"it will advance the spark for premium fuel."
Last time I posted that, someone corrected me.
If your engine is designed to run premium and you use premium, the ignition advance will be at stock setting.
If you run regular fuel, the advance may be retarded under certain conditions.

If your engine is designed for regular and you run premium, the ignition will not advance.
Click to expand...

Makes sense. My experience comes from me being the ECU and twisting a distributor.
 
I have not yet seen a Guzzi with a knock sensor or any other way to tell what fuel you put in it. The ECU does what it is programmed to do. So far Guzzi's I have seen are not that sophisticated. Most motorcycle engines are in that same boat, however. That being the case, if you use fuel that does not have sufficient octane to avoid knock or detonation then you will get knock or detonation. The ECU will not tune to correct this.
That said, if you have an engine that does have a knock sensor but was tuned to use 89 octane fuel and you put in 93 octane the ECU won't adjust beyond its programmed range to get you more power out of the 93 octane fuel.
As said, start with the factory recommended fuel. Go up or down from there based on your results and what fuel is available.
Interesting note, if you are high up in elevation or for some other reason air density is low you can run lower octane then standard recommended without risk of knock. As air density goes down a normally aspirated engines octane requirements also go down.
 
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