what's the highest mpg you have ever gotten with a full tank? mention what chassis and whats done to the car, tune etc.

I found that Shell gas gives me more mpg.

Last week got 443miles out of a full tank, with city driving mainly.

thats with 550cc, old secret service ecu tune, that prob needs a re-tune, used O2 sensor n couple month old sparks plugs with brand new coilpacks.