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· Premium Member
289 Posts

High octane gas burns a lot cooler than regular.

Regarding mileage, I've had big improvements in fuel economy/power
using 49 state gas. The California gas has a lot of oxygenators
that don't burn so well. I used to get 44 mpg on my Kawasaki with Ca gas, I got 56 mpg on Oregon gas.

I've noticed that Shell has a fuel that uses gives better mileage. I've
heard that it includes friction reducers, thus the better mileage.
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