What do you get for MPG?

[LUMINATOR]

Just was wondering what all you guys get for mileage with your w-body's?

[jake91]

17 city 28 highway 21 average in my Gtp

 

18 city 26 highway 19 average in my old 3.4 vert

 

 

Sent from my iPhone using Tapatalk

[Night Fury]

Awful. Dreadful. Disgusting.

 

I have a running average of 18mpg and it's difficult to get over 25 on the highway.

 

Obviously something is wrong with my engine, I plan to swap in a 3100 in the next few weeks.....

[19Cutlass94]

I would hate to know what I get for mileage with the upcoming upgrades and the high ass gearing of a 284..

[RobertISaar]

with the MC, "lifetime" average in the signature... that's really only the last year of me keeping track of it though.

 

the 90GP.... did similarly.

 

i live in the middle of nowhere and don't see much stop/go driving though. all highway trips(at 70+ MPH) generally return no less than 32MPG.

[runt]

'07 GT average about 18-19 in town and 26-28 on the highway. Overall is somewhere around 19-21. I have enough stop and go driving and hills around here that my daily commute really gets hammered.

 

Stock tune, no mods.

[skitchin]

Under 20MPG in my work commute which is pretty good considering all the traffic I crawl - probably less than 5 minutes of open roads out of my 30minute commute each way... Highway is usually high 20's low 30's, depending on the lay of the land. Hard to say, been so long since I've seen the open roads ~_~

[Euro]

I'm glad to hear other L67's aren't getting that great of mileage . I fill up every 7/8 days if I'm lucky. But I drive at least 75 miles a day. I rarely drive highway, but my work commute is 25 miles one way, all 45+mph roads so it's not stop and go.

 

I'd say around town 18ish, and highway/my work commute 26-27ish.

 

Straight highway on a trip, for example, it's over 30.

[carkhz316]

Well, I very infrequently drive the '92 to ever get enough miles to figure out mileage, so that leaves the others. I also have never really tabulated a combined average or really done all city in a tankfull. So as it stands best highway mpg:

 

Monte (NA/ before): 31; topswapped: 32

Impala: 34

Silverado: 15 (best, very rare; usually highway averages 13.5)

[redgrandprix]

i get around 27-29 on highway and in the city probably like 15, its almost an night and day difference

[GP1138]

My GTP used to get 28-30mpg on the highway with the double platinums I had in there, but I switched to plain Autolite 606's and lost a few MPG. I can tell the difference.

 

I commute 80mi a day, mostly 75-80mph highway driving.

[Schurkey]

92 and 93 Lumina Euro 3.4s

 

Used to get a fairly-reliable 28 mpg at steady 70--75 mph (right at the sweet-spot of the 3.4L intake growl) with the '92, which I've had since late '92. With age on the vehicle, I'm down to 24 mpg at about the same speed.

 

The 93 Lumina has gotten about the same 24 mpg at 70--75 since I've owned it--but that's only been about five years.

 

My theory is that the faulty-GM-Engineering on the engine resulted in piston slap so bad that the knock sensor is pulling timing. This reduces power and mpg; and should have been actionable by the EPA as a violation of the Clean Air Act and perhaps CAFE standards--because the reduced timing most likely increases exhaust emissions while decreasing fuel economy. My first complaint to the local Chevy dealer about the engine knocking noise was most likely within the 5-year/50,000 mile emissions warranty, but resulted in the dealership pointing at a service bulletin for lifter tick. I performed that service later, with no improvement of the knocking.

 

Of course, the Government is as corrupt as GM, so I'm stuck with the piston slap and knock-sensor activation on both cars.

[GP1138]

92 and 93 Lumina Euro 3.4s

 

Used to get a fairly-reliable 28 mpg at steady 70--75 mph (right at the sweet-spot of the 3.4L intake growl) with the '92, which I've had since late '92. With age on the vehicle, I'm down to 24 mpg at about the same speed.

 

The 93 Lumina has gotten about the same 24 mpg at 70--75 since I've owned it--but that's only been about five years.

 

My theory is that the faulty-GM-Engineering on the engine resulted in piston slap so bad that the knock sensor is pulling timing. This reduces power and mpg; and should have been actionable by the EPA as a violation of the Clean Air Act and perhaps CAFE standards--because the reduced timing most likely increases exhaust emissions while decreasing fuel economy. My first complaint to the local Chevy dealer about the engine knocking noise was most likely within the 5-year/50,000 mile emissions warranty, but resulted in the dealership pointing at a service bulletin for lifter tick. I performed that service later, with no improvement of the knocking.

 

Of course, the Government is as corrupt as GM, so I'm stuck with the piston slap and knock-sensor activation on both cars.

 

I bought a '90 Lumina that had a knock sensor problem, and it pulled a shit-ton of timing... and it was really obvious. I guess the only thing you can do is get a scanner and watch what it's doing. I mean, if the newer 3100's have a terrible piston slap that's audible to anyone when the car is started cold and this doesn't cause knock issues... I can't imagine this would.

[LUMINATOR]

I have a 90 Lumina with the 3.1 in it and when I start it up when the engine is cold it seems like it has a knock but once it warms up it seems to go away? Could it be a bad knock sensor, can you replace the knock sensor

[19Cutlass94]

It's either the lifters draining of oil, and once they get pumped up again they stop, or it's piston slap. Has nothing to do with knock sensor.

 

 

Sent from my iPhone in some random spot of Texas.

[Schurkey]

It's either the lifters draining of oil, and once they get pumped up again they stop, or it's piston slap. Has nothing to do with knock sensor.

If the knock from the collapsed lifters, or the knock from the piston slap is bad enough, the knock sensor senses the vibrations and pulls timing. You're right, the knock sensor does not CAUSE knocking. It is AFFECTED by knocking

[RedNightmare]

I usually average around 20mpg on the hud display.. I can see it going up in the future.. no longer driving out to guam every night.

[BS009]

I get about 17 city and 30 highway in my 94, though city driving for me consists of a stoplight every 1/2 mile and traveling up and down large hills everywhere I go. My elevation must change at least 100 feet every 1/2 mile. Highway mileage is averaging around 75-80 mph

 

Got about 15 / 26 in my other 99 GS before I sold it. Hoping to see better with my new one once it's running.

[LUMINATOR]

Oh ok! Aren't they 3.1's known for a knock or a piston slap ?

[Addicted To Boost]

I'm averaging 23 right now with the cold weather and shitty winter fuel. In the summer, it creeps up to 26-27. On an all highway trip last summer, I pulled off 29.3. I also have the 3.29 gears in mine.

[Galaxie500XL]

I've been daily driving my '95 LQ1 for nearly 4 years now... Average weekly MPG averages around 20.5-21.5, that's about 60% highway, 40% stop and go.

 

I've been on one long trip, <500 miles, and averaged around 27 on the highway with an average speed of around 70. Would have been a bit higher, probably, but crummy traffic through Atlanta both ways dropped my MPG by maybe 1.

[Night Fury]

I'm averaging 23 right now with the cold weather and shitty winter fuel. In the summer, it creeps up to 26-27. On an all highway trip last summer, I pulled off 29.3. I also have the 3.29 gears in mine.

 

More like 3.awesome gears!

[pshojo]

My 95 LQ1, i get 22-24 highway and average town/highway 17-18. The 3.8 with the LQ1 trans I get 25-29 Highway.

[Jprice90]

around 25-27

[revnrob]

95 GP 3.1

 

19-22 City

28-32 Highway