Still amazes me how many people can beat the EPA city mileage by 50%. This is one amazing car. Probably the only one on earth car that can beat the EPA estimate on a regular basis.

Maybe it is different definitions of city driving. I commute 5 miles which includes 17 stop signs or lights and two RR crossings. Two of the lights take at least three cycles to get through. The max speed limit is 35, most is 25. A train usually means 5 minutes of no movement. It usually take me 25 minutes to go 5 miles.

When my car was new, I got 19.5 on my commute. Over the last 6 years that has dropped to 17.4. I attribute the drop to 10% ethanol. Highway has always been 24 to 27 range depending on the drive.

One last thought. From what I have read repeatedly over the years, octane has no bearing on MPG. Ethanol certainly does.