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Originally Posted by 987gator
For an 05 987: Pre 10% ethanol in all central florida fuel - 23 to 24 mpg mixed highway / city driving. 29.5 mpg on an Atlanta to Orlando trip, top up, 75 mph tp 80 mph.
Now with the 10% ethanol fuel - 20 to 21 mpg mixed highway / city driving. I have not done a road trip, but right after fill up, on a 10 mile highway stint at 75 mph the OBC noted 27 mpg.
It may be a coincidence, but I think the ethanol blend has robbed some fuel efficiency.
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Ethanol has a lower energy density than gasoline, hence the lower mileage.
I generally get 19-20 mpg from my '03 2.7L w/Tip in mixed city/fwy driving. However, given gas prices, I tried soft-pedaling it on the last tank, keeping it to 75 mph on the fwy (instead of 90 mph), and using my cruise control. All that brought me up to 22 mpg - not sure it's worth it.