DaGeneral

iTrader: (3)

I am averaging about 160 miles per gallon on my tank and my car is basically stock, only a cutout and the lid. I go WOT maybe 1 time every two days and shift relatively smoothly. Something has to be wrong because thats maybe 9 miles to the gallon, which is pathetic. Fuel filter? O2's? Thanks

EDIT: 160 miles of all city driving

iverson387

i get about the same thing in ny all city driving. is this not normal because i still get 23 mpg on the highway. i have a few mods but nothing major lid catback

ls1z28chris2

Something is wrong. I get much better gas milage than that in my car with significantly more mods. Hopefully someone can chime in to give you an idea of what the actual problem is.

white2001s10

iTrader: (4)

Without datalogging (preferrably with a WBO2), you might as well ask the magic 8-ball.

2000slpss

iTrader: (27)

im havign a similar problem. i just installed an intank walbro 255 and a timing tuner and my gas mileage dropped by alot. i went from like 16 mpg to around 10 mpg overnight. no check engine light or anything. any ideas?

flash12t

iTrader: (1)

ya same over here. . i used to get close to 200 miles on a tank but now im getting sumwhere around 160 - 180 depending on much high way . .and ihavent changed anything. .? it all started when my clutch started to slip im wondering if that could be the problem .

Powered By V8

iTrader: (2)

ill average about 200 miles to a tank city-ish driving and about 220-225 highway-ish driving. pure highway driving would probably be close to 235-250 but ive never taken any long trips like that

105

iTrader: (7)

damn! on my 2001 z28 m6 I get over 300 miles to the tank city/hwy. I try to run as few appliances as possible. keep that a/c off! unless you have a passenger that requests it or something.

milleniumZ28

On my 2000 Z28 M6 I get between 260-300 around town and near 400 on the highway. I don't think that appliances could cause a loss that large to drop mpg to around 9. That is just horrible. 9 mpg $3.00 per gallon so you only get about 3 miles for every dollar of gas you put in.

Matt D

iTrader: (49)

Have you guys looked at the Air:Fuel? I have all the boltons, 4600 converter, 3.42 gears, and the MS3 cam and I get 16mpg in the city. I daily drive it and A:F is 12.7:1.

who281

iTrader: (1)

i dont really know wat i am talking about...but my car was getting **** for gas milage and my fuel pump just broke on me...i got it replaced and now i get alot better gas milage...just an idea?

NBMgreg

iTrader: (7)

could the walbro 255 fuel pump decrease gas milage over a stock OEM one?? thats what ive been wondering... i need a new fuel pump.

JimboManJones

Brakes might be rubbing? Jack it up and see if those wheels spin freely.

2000slpss

iTrader: (27)

i spoke with my tuner just recently and he told me thjat with the walbro i mpushing more pressure which is why its running soooooooo rich, he said with a little bit of tuning it'll be back where it used to be

nikeair042

I get around 285 on a tank of gas, which is mostly high way miles, putting it in 6th gear at 60 mph, basically babying the car to save gas, it average around 21 miles a gallon which i think sucks considering the window sticker says 30 on highway, 19 city, with a 6 speed, and my car is stock for the most part. I ran it close to empy, put in 13.7 gallons of gas. I put some STP fuel injector carburator cleaner in there to see if it helps, if not I will try the STP gas stuff...

LittleSlow1

rear end gear ratios would help alot in this thread.

I know most Z-28s come with a 2.73. I have a 98 Trans Am A4 that has a 3.23 in it from the factory with a 3600 stall, lid, full lenghts,and an off road Y-pipe that gets about 180 miles per tank full of gas. The car got the same mileage before I put the converter and full lenghts/Y-Pipe on it. Does anyone have the same or close to the same combo ? If so what kinda mileage do you get ?

98WhiteDevil

iTrader: (16)

I get 27mpg on the free way and 18mpg through town and check out my mods in my sig.

RedWS6 00

False info, your fuel pressure regulator controls the preasure. Hell yeah the Walbro can flow more, but after the regulator its still around 58psi unless the regulator has gone faulty.