c4boom

iTrader: (1)

no mater what I do or how I drive I can not due better than about 21 mpg even if I set it on cruse at 70 I still only pull about 21 my best ever is about 22. usually I get about 19.5 with rural driving. my car is a 2001 camaro m6 ss. this sound about norm all these guys keep pulling numbers like 25-28 mpg on the freeway.

TheSilverOne

iTrader: (22)

when was the last time a tune up was done?

*98TransAm*

do a tune up and stay out of it

johnLs1camaro

iTrader: (28)

well are you a mostly backroad driver?? also look at getting a tune up, do you have any mods?? that mpg does kinda suck, my stalled and cammed A4 gets about 19 and im on the backroads half the time..

samson_420

iTrader: (1)

^ What he said. . fuel filter, air filter, plugs and wires depending on the mileage.

c4boom

iTrader: (1)

new plugs msd wires wix fuel filter and air filter less than 3000 miles ago

arh headers high flow cats
magnaflow cat back
slp lid
and a dyno tune

dont know last time the o2s where done but at 80 bucks each i know i have not done them in the 7000 miles I put on the car.

o car has 86000 on it

and as of the back road thing a bout 50% back road 20% highway and the last 30 is 50 mph major 2 lane roads

samson_420

iTrader: (1)

It might be the tune. . . maybe.

c4boom

iTrader: (1)

how often should the o2s be replaced?

johnLs1camaro

iTrader: (28)

yeah thats what im kinda thinking....has you cars mpg always been that way, and what did your car dyno(curious).. maybe its way too rich or something??does your car run pretty good??

sweetbmxrider

iTrader: (13)

maybe consider a gm top engine clean? probably some carbon up top hurting you. that or seafoam.

c4boom

iTrader: (1)

runs ok I geus not much to compair it to. It has a small idle stumble hicup and it has always got about that since I bought it. It pulled the 22 before all the mods.

TheSilverOne

iTrader: (22)

what year is it? those numbers seem low.

c4boom

iTrader: (1)

the car is a 01 on the same dyno a c5 zo6 put down 348 or so HP and before he even made the pulls he said the car was going to pull about 330 -340 with my mods so it isnt to far off according to peat at performance dyno in concord nh.

off course I dont know if he even did a street tune on it only a wot tune

Rhedalert

iTrader: (21)

when you do 70 on the highway, how long is each trip for? Are we talking all highway, no stops/cool-downs, or is this more like work commuting? That will make a big difference in the numbers you get.

For example, if I take my Camaro to work and back for a week, it's 80% highway, I go between 70-75mph. I go ~35 miles each direction, so on a 300 mile tank, I took about 8 trips. That's 8 cold-starts and warm ups. Work commuting I reach around 21-23 MPG.

Now if I take my car on one long trip, going the same 70-75 mph, I'll pull around 26 MPG.

c4boom

iTrader: (1)

ya i have never done a 100% highway so i am low but not realy low for my type of driving. how often should the o2s be replaced.

rvnsky

iTrader: (8)

pshhhh id be happy if my car got 15mph anywhere.

FlashLCD33

iTrader: (8)

If you do a lot of short trips (drive the car cold, to where it never gets the chance to warm up) you will be open loop and not getting optimum MPG. With a performance tune you usually run a little bit richer to make more HP, compared to lean for maximum economy.

Cole Train

iTrader: (30)

that's crazy, man is it an auto? i may have missed where it was said so be patient with me. My C5 with mods in sig and power in sig got 33mpg on my 200 mile(each way) trip to Duluth from central MN and 34 of the way back. This was verified by filling up when left town, resetting Trip and filling when i got to my hometown and not off the DIC although the DIC was almost dead on and only off by 1mpg. I'd say the car needs a tuneup or a it's in your Tune~Cole~

Cole Train

iTrader: (30)

Also here i do believe that you get more power if it's just slightly lean vs. rich. Just what my tuner Doug Rippie from DRM said

MaroMan

iTrader: (6)

I get 7mpg. Suck it up and enjoy it while it lasts.