Oh come on, John... that joke's been around the net for a decade
For what it's worth, my '99 neon r/t is EPA rated at 29city/41 highway. 2 liter dohc motor, optimistically rated by dodge at 150hp/133tq. Since then I've opted for cold air intake, mopar street header and mopar tuned ecu. (all carb legal)
Best I ever got out of that car was going 65 the whole way and netting about 38mpg on a continuous freeway cruise. Coming back from MSA last year with mods mentioned above, and about 93k miles... I got 35-36mpg with average speed of about 80mph... with occasional 4-5 mile runs like this:
usual mixed driving (60% freeway, 40% city and traffic, regular use of leadfoot syndrome) gets me 30-33mpg