shotiable

i get 23 mpg. mostly freeway. 26mpg isnt remotely impossible. just depends on your driving. i could get to 26 when i freewheel a lot.

JGard

Also during the winter the gas is oxygenated (or whatever it's called) for the sub-freezing temps. That causes your mileage and power to suffer. Granted, this is only true if you live in a northern state, as I do.

Also, with regards to synthetic oils, I couldn't agree more. However, look into Royal Purple. As far as transmission and differential oils go, that's the bee's knees, as they say.

JDM S2000

Im getting over 25, I have a SC and 4.56 gears.
Something is wrong

aggie

I noticed you just switched to a k&n filter - maybe you have been enjoying the new sounds from under the hood

Don't forget other obvious culprits like low tire pressure or worn out spark plugs (I just changed mine out at 50k just because).

MattG

Adjust the valves. There was a thread about doing this yourself, and IIRC there was a meet where people were showing others how to do this also.
Gernby has reported that his fuel economy was improved by doing this.