General LSX Automobile Discussion Non-technical LSX related topics.

how many mpg do you guys usually get???

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Old 03-14-2011, 08:57 PM
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If you're getting really bad mileage, try changing your front sensors (Get the cheaper Denso's as it's the same exact ones that you would get it if you bought AC Delco's).

I was getting 15-16MPG no matter what driving conditions. I just changed my front O2's and i got almost 100 miles out the first quarter tank (but we all know it's quite more than a 1/4) so it's looking quite good.

The first owner of the car also changed the rear to a 3.73 without changing the PCM. Also, the shift points and converter lockup points are total CRAP. So next on my list is getting, at least, a mail-in tune if the PCM i ordered ever comes in!
Old 03-14-2011, 09:10 PM
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I beat the pis out my car constantly and always pull 17-19mpg.
Old 03-14-2011, 10:14 PM
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12mpg average all city driving... I drive it like I stole it lol not really, but stop and go with a cam sucks for mileage. If I wanted good gas mileage I would have bought a Prius or some bull **** like that.
Old 03-15-2011, 07:59 AM
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i've gotten a consitent 14 mpg (city) since i bought this car back in may 2010. its mostly stock except for a SLP lid and SLP cat back exhaust. (2002 Camaro SS LE 46,000 miles)

6-speed with a clutch that sucks, releases real high, but holds well. i try to keep the tire pressure checked.

i knew this thing wouldnt get the greatest milage, but i thought it would do better then 14 mpg.
Old 03-15-2011, 06:25 PM
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how come you get 10 now?
Old 03-15-2011, 06:52 PM
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Lid, msd wires, 3.23 gears and LM1 catback, and I get 19-20 mpg in mine
Old 03-15-2011, 06:53 PM
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Originally Posted by elwood2
If you're getting really bad mileage, try changing your front sensors (Get the cheaper Denso's as it's the same exact ones that you would get it if you bought AC Delco's).

I was getting 15-16MPG no matter what driving conditions. I just changed my front O2's and i got almost 100 miles out the first quarter tank (but we all know it's quite more than a 1/4) so it's looking quite good.
Bad 02 sensors throw a code, and don't go bad often.
I had a bad sensor in the past but mpgs weren't affected.
Old 03-16-2011, 06:33 AM
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Well someone else can do the conversion, 17 litres per 100 klm.
Old 03-16-2011, 03:42 PM
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How is everyone getting 20+ mpg in the city with their LSx cars? Did you swap in a Prius motor?

I get 21 - 22 at best on the highway with my car and that's assuming I have the cruise set for almost the entire ride. As for the city, 11 - 14 is reasonable for me with most of those tanks being in the 11 - 12 mpg range.

Running a N2O tune on the street so I understand it's a shade rich however I never saw anything like the high numbers in this thread even when the car was almost bone stock.
Old 03-16-2011, 05:43 PM
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Originally Posted by bad_408_vert
Bad 02 sensors throw a code, and don't go bad often.
I had a bad sensor in the past but mpgs weren't affected.
True, they can also go bad and not show up though.. Im wondering if mine are doing that right now actually.
Old 03-19-2011, 01:54 PM
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Just filled up this morning, averaged a tad over 18MPG all city driving. Recently changed all fluids and ran a Chevron Techron fuel system treatment a fill up or two ago. Definitely did better than expected. Cant wait to hopefully one day take it for a road trip and get over 300 miles on a tank!!

BTW, I ONLY run Shell V-Power in it. M6 car, 110K miles.
Old 03-19-2011, 02:01 PM
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I get around 21-22 combined 18 city. I haven't really done any highway driving.
Old 03-19-2011, 03:20 PM
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Originally Posted by Midnight02
How is everyone getting 20+ mpg in the city with their LSx cars? Did you swap in a Prius motor?

I get 21 - 22 at best on the highway with my car and that's assuming I have the cruise set for almost the entire ride. As for the city, 11 - 14 is reasonable for me with most of those tanks being in the 11 - 12 mpg range.

Running a N2O tune on the street so I understand it's a shade rich however I never saw anything like the high numbers in this thread even when the car was almost bone stock.
I had a 2002 SS M6 12 bolt w/ 4.11 , lid, tune, and it got 27 hwy with cruise on 75. Had a 2001 Formula M6, heads ,cam, bolt ons,4.10 gears and it got 23-24 on the highway. Got a 2001 Z28 A4 w/ 3.23 gears ,bone stock and it gets 25+ with cruise @70. Alot of it is driving style or could be in your tune.
Old 03-20-2011, 02:21 PM
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Originally Posted by Killer5.3
I had a 2002 SS M6 12 bolt w/ 4.11 , lid, tune, and it got 27 hwy with cruise on 75. Had a 2001 Formula M6, heads ,cam, bolt ons,4.10 gears and it got 23-24 on the highway. Got a 2001 Z28 A4 w/ 3.23 gears ,bone stock and it gets 25+ with cruise @70. Alot of it is driving style or could be in your tune.
Those numbers sound about average. Ive always questioned those guys claiming to get anywhere near 30+mpg, even on the highway with these cars. Ive owned 3 Fbodies and never gotten better than 26-27 on the highway..My current car with the below mods averages 16-18 with a good mix of highway/city, on a strictly highway trip, it got 22.6 which for having >400rwhp isnt bad at all IMO.
Old 03-20-2011, 02:55 PM
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i average about 17-20 mpg
Old 03-20-2011, 03:17 PM
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My 99 WS6 got 29 on the way to San Antonio cruising at about 90mph with a couple fun runs, way back I think it was 27.5. In the city, anywhere from 14 to 17mpg. 02 SS got 26.5 doing 100mph whole way to Dallas along with several 140mph runs and 3 people in the car, don't remember what it was the way back. City was about the same as the T/A. The 98 SS with the A4 got pretty bad mpg's, I only put like 200 miles on it but it seemed like I had to put 10 bucks in every time I drove it.

WS6 had exhaust, 12 bolt and intake. 02 SS had exhaust, both 6 spds.
Old 03-20-2011, 04:54 PM
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Kansas City to Minnesota and back I avg'd 31.4 mpg with mods in sig at 75/80 mph with a few go fast pulls!

Vince
Old 03-20-2011, 05:33 PM
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City - Avg @ 18
Hwy - Avg @ 23 ( Heavy Foot )
Old 03-20-2011, 10:06 PM
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I got about 27 highway, maybe 19 city when stock. After mods I still do pretty good, about 25 hwy but I didnt get this car to baby the gas pedal
Old 03-20-2011, 10:15 PM
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Originally Posted by ravensfan
Those numbers sound about average. Ive always questioned those guys claiming to get anywhere near 30+mpg, even on the highway with these cars. Ive owned 3 Fbodies and never gotten better than 26-27 on the highway..My current car with the below mods averages 16-18 with a good mix of highway/city, on a strictly highway trip, it got 22.6 which for having >400rwhp isnt bad at all IMO.
Damn right, being able to have a 400+whp racecar & get 20+mpg was unheard of back in the day. There was a few guys with them rare SD455 TAs at the car shows last summer & crying that they were only getting 10 mpg.


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