99SSHawaii

Lets see, I usually end up putting about 14 gallons in the tank when I fill it up, and at that point I have about 135 miles on the tank all together. So I figure about 150 miles give or take on it. Car seems to be running fine, aside from a rattling at low rpms like around 900-1200 rpm, and the p0137. I have cause to think its' the cats, but am unsure on the matter. In addition, my local dealership wants to charge me 120 bucks for the diagnostic fee, and will only cover the whole repair (cat warranty 8yr/80k) if they deem it neccesary. i.e. I get slammed with the 120$ fee if they don't think i need a new cat. In addition, it's virtually impossible to change my o2 sensors, I've tried, they won't come out, and the cats are in the way.

'Trust'

iTrader: (24)

Your O2's will come out, you just have to put some serious effort into it. Its up to you, 150 Miles a tank and leave the O2's, or 250+ Miles a tank and change em. Your losing money if you don't do anything.

fenix99

iTrader: (1)

yea mines is pretty low...but not 150mpg low...more like 180mpg low...A4 stock everything...not with the turbo and 42lber's i wanna change my 02's front sensors for the hell of it and try checking the mileage cruising the whole time to see if i can get some decent mpg out of one tank... aand yea i gotta stay away from boost lol

99SSHawaii

Yeah, its wierd though in that it looks like the cats on my car are welded on differently than they were in my two old 99 SS's, in that the cats are flipped to prevent access with a crescent wrench.... any tips?

dave70

iTrader: (2)

i get over 300 highway and close to 300 and close to it in the city if i keep it down and that's with no cats headers no air no egr and 4.10's

Specialized

iTrader: (15)

I think I call BS on that.


But anyways, yeah 150miles/tank is bad. One time I did that to about 5/8s tank.. so I used 3/8s and I went 150miles.

I usually average around 250miles/tank but I drive mainly city.

will69camaro

iTrader: (19)

I wouldn't necessarily call bs on it. I get around 400 miles to a tank all highway and over 300 in town and i hav similar mods.

William

Bo White

iTrader: (59)

The worst Ive ever got on a tank was like 220ish but that was playin around all weekend and my car's an A4. The M6 cars get better mileage but anything bellow 200mpt is just WAY too low.

4merlt1user

iTrader: (1)

i average around 215 through a4 with stock stall in traffic racing and driving normal

bjamick

iTrader: (31)

well ive never filled mine up bc gas weighs to much and my gas guage doesn't work 4 some reason so couldn't tell you.. but i hope mine is getting what yalls are getting

BKGarrison98TA

iTrader: (2)

the 98's have smaller tanks so it changes the miles/tank

even with my cam I get over 200 city and over 340 highway

that error code is the O2 sensor

if the cats are in weird it's probavbly not going to be covered under warantee since someone modded it, I would say just go LT's and new Y-pipe

badpewter-z

iTrader: (4)

and here i was thinking 250-280 in city stop and go traffic was bad
seriously though get what ever is setting that code fix and probbly a good tune up then go from there. was it always this bad?

Cobra2WS6

iTrader: (22)

I get around 180 city in my stock 01 SS M6 babying it... My supercharded cobra with 470rwhp got 250ish city... Why does this car suck so bad on gas?

blue02formula

iTrader: (1)

I can get 280 miles and only need 12-13 gallons to fill it up commuting. I have made it well over 320 on the highway and not been on empty. I have most bolt-ons and a 12 bolt with 4.11's with a M6, with 122,000 miles.

ls1charged

iTrader: (8)

u should try skipping 3rd gear when your cruising around, a friend of mine did that for a full tank and got a extra 40 miles or something like that for the tank.

BAD2000TA

iTrader: (6)

I think a lot all comes down to how you drive. If I'm conservative, meaning short-shifting, use 6th gear for all speeds above 50, then I get between 250-270 per tank. However, if I play a little, meaning rev out in first and hit hard in second, then it drops to around 190-220 depending on how much playing around I do. Highway cruising for long distance is great in our cars. Everybody should be over 300 for 70mph, 6th gear cruise-control on driving. But, city driving is way different. Stop and go is terrible for fuel economy. Plus, there's always that temptation to hear that LS1!!

jrivera04

My Z gets around 260 mpg. And that is mostly city. I have gotten to 300 mpg with conservative highway cruising using the cruise control.

blue02formula

iTrader: (1)

I'm callin' unless you bought a Tornado thing for your intake.

DarkCloud

i think 150 sux.. thats wut i used to get in my z.. i get well over 200 now... try doing a tune up.. or something..

black97ss

iTrader: (6)

is that like a super hybrid or something???? that mileage is incredible!