my wifes 99 accord has really bad gas mileage, I put twenty bucks of gas and it only gets a little more than half tank and the gas here cost 1.87, then that gas goes down really quickly. Any ideas of whats wrong? Oh yah and the tank doesnt fill all the way up no matter how much gas we put. Thanks for any help.

 

try the pcv valve...air filter...

my 4th gen goes 580km /tank now w/ a jdm f22b

 

DUDE.....find out where the gas is going

 

Try figuring your mpg. This makes very little sense so far.