What happened to my gas mileage?

[letsdrive]

dont forget to change the pcv valve if it doesnt rattle anymore....along w/ spark plugs/wires, cap and rotor.

 

[SLV_DB7]

Dang, i'm not really driving hard, 80% highway at 80mPh and i'm only getting 250 miles on a tank. You guy's really got me thinking

 

[red98teg]

^nice to know im not the only one...

 

[AcurInteg96]

Im getting about 210 to a tank. but i dont think my gas light works so i dont drive it to empty. and im having O2 sensor problems. what kind of plugs and wires do you guys suggest.

 

[sciullo779]

yea i just got a 2000 ls with 85k on it, drives great and the motor purrs lol but im only getting 21mpg

update, 21mpg with "plus" 89 octane, now im at 3/4 of a tank of the cheap stuff, 87octane with almost 75 miles on it