Fuel Economy

[voodoo22]

Originally Posted by BailOut

I've done that. 89 Octane = a loss of 5% MPG, 93 Octane = a 9% loss.

I tried 2 tanks in a row of each to get a more accurate test (and the low numbers hurt my running tank average). Without a doubt I consistently get the highest MPG with 87 Octane.

Aside from my much calmer driving style two other things that may make a difference for me are that we're always on 10% Ethanol here and I'm at a higher altitude than most folks (my home is at 4,500ft., my office is a 6,350ft., and I traverse an 8,900ft. summit to get there).

Do you have Shell gas around there which put 0% ethanol in their V-power? I wonder how that would result. I can't see you gaining over 9% based on no ethanol. I only use regular and can't justify spening over 10% more for gas when the car doesn't need it. After years of buying premium, spending less than $30 on gas at the end of the week is something I don't want to give up

[BailOut]

Originally Posted by voodoo22

Do you have Shell gas around there which put 0% ethanol in their V-power? I wonder how that would result. I can't see you gaining over 9% based on no ethanol. I only use regular and can't justify spening over 10% more for gas when the car doesn't need it. After years of buying premium, spending less than $30 on gas at the end of the week is something I don't want to give up

I only use Shell gas and E10 is a mandate. Regardless of the Octane level, if you buy it in Nevada or California it's 10% Ethanol. In the cold months it gets worse as our Winter fuel - by mandate - is E10 RFG (reformulated gasoline).

This helps the lead-footers produce much less emissions, which is a good thing, but by proxy it robs the proper drivers of lots of mileage.