i know theres tons of threads out there about mpg, but i've read them all and i asked around my local mechs (norman from sidepex?) and the forums tell me 12mpg is kinda low but the mechs told me it's normal and 15-17mpg is really rare. my car's completely stock, it's been given a recent full tune up and had the idle turned down. i'm still getting 12mpg from a 11.6gal tank? i was thinking o2 sensor, how much would it cost to replace (minus labor)?

o2 sensor is $35 +/-



makes all the difference in mileage. my stock 91 is getting 22ish, which is better than expected

i'm getting around 18 or 19 in city. but it still stinks horribly rich.

yeah, smell has nothing to do with mpg https://www.nopistons.com/forums/pub...#>/biggrin.png

how can i check my o2 sensor? can i replace it myself with basic tools?

i get 17ish mpg city driving w/ an 88 n/a with full exhaust, intake, all emissions removed etc etc. with a/c and p/s still on it too. and the plugs are like 10k-ish miles old. on the highway ive come close to around 22-24mpg.



kevin.

hmm i need an alignment pretty bad too... actually, all new suspension if i were to bother.

Ive consistantly hit 20 or 21 combined on a stock 88 N/A, so it is possible. definately check your O2 sensor, and at 12 mpg, make sure u dont have a hole in your gas tank. Does it smoke on startup?

no smoking.



can the mpg have something to do with my brakes?

well, it would, but only if they were REALLY dragging, or you just like keeping the middle pedal depressed when driving. Unless one of the calipers is completely seized, i doubt ud take a 50% hit in fuel economy, and if one of them was seized or dragging, you'd be able to hear and feel it