Quote:
Originally Posted by truckster
Sorry, that's not at all true. Octane does absolutely nothing to increase fuel economy by itself.
What is true is that higher octane allows you to run a higher compression ratio, as with turbocharging, which may be one component of increasing fuel mileage, but there are many variables to consider when calculating expected fuel mileage gains.
Having said that, I run premium in my Z/28, but that's because the computer will sense the lower octane and retard the ignition timing. Unless your car is designed for premium fuel (read: high compression) you derive absolutely no benefit from running premium.
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Well , I run 93 in my 69 Mach 1 and get 3 miles more per gallon than reg fuel , I also run mid grade in my 2018 GMC and get 2 gpm over reg. Neither are turbo charged and neither are above 9:1 comp ratio.