Hi guys,

Just taking a small poll on what kind of mileage you guys are getting from your carb'd v8's??

Post your engine (5.7/5.0), carb (600/750cfm) and current mileage
MPG?
Litres per km?
whatever?

I've just rebuilt mine and it seems to run good, but this is my first z28 so I'm curious to see how mine fairs in comparison.
It's in storage for the winter but will be rolling soon as the snow melts.

Last time I took it for a burn I was around 12 mpg, but kept it pinned most of the time, I'm hoping to get around 18-20 with mild driving.

Thanks

 

15mpg city highway, lead foot

 

'84 LG4, all stock. Was around 20-23 MPG when I got the car in 1998. The carb has never been rebuilt so now I seem to be getting in the 14-18 MPG range. Projects for 2005 will be freshening up the carb.

I get around 5-10 MPG in my '71 T/A. Gallons per mile if I have the pedal to the floor!

 

83 Z28, LG4, q-jet,

26-27 Highway
City varies a lot due to my driving urges. ~18

 

23-25mpg highway on a good day

305 w/ stock carb, Edlebrock intake

carb needs rebuilt, and it will be getting headers and a 3" exhaust soon

 

'83 Z28, 5-speed, 3.73, Holley 4bbl 350

I get about 350kms/tank... not sure what that is in MPG though.

 

How much to fill your tank? I think you guys are about 80 cents a litre?

 

20+ highway mileage

anywhere from 8-12 city mileage.

310cubic inches
600cfm holley vaccum secondaries
700r4
4.10 gears

there is a lot more that plays into mileage though:cam, stall coverter, exhaust, etc.

specs in my cardomain site.

 

360 Cubic Inch with 650 Holley Double Pumper- 3.42 gears and a 700R4
City 9-13 Depending of how par the go pedal is down
Highway- 15-16 cruising at 70

 

Full size van with a modified 350 and a lead foot with a non computer Q-jet nets me an amazing 12-14 mpg in town and about 17-18 on long trips cruising 75-80 most of the time.

 

I dont know, honestly. I just put 20 bucks in once or twice a week.

 

45 doesnt matter what the price is its always 45

 

Avg. from 3 tank fulls.

88 camaro, 355, 10.18:1, 272/284 cam, edelbrock 600 cfm, th-400 trans, 2800 stall, 3.42 locker rear, 255/60-15 rear tires, 235/60-15 front tires, headers, dual 2.25" pipes, no cats, flowmaster mufflers

12.80's-12.94 ET at 118 mph (no traction, but speed shows if I had good traction 11.40's is in her)

14.24 MPG. Thats an avg. of 3 tank fulls ran in the city, highway, ******* the car some, slow speeds, fast speed (above 100mph)



My dad is getting 15-16 MPG (avg.) in his 84 camaro

337 (327 +.060") 9.18:1, 278/290 cam, edelbrock 600 cfm carb, 3.23 open rear, 1600-1800 stall, th-350. Runs 13.60's @106

 

Sadly, when racing, I get 1/2mi. to the gallon that's leaving my pit, burnout, staging, return road, etc...takes 1 gallon exactly per pass.

Interstate driving during cold weather averaged 1.4mpg

street driving/cruising about 2.8mpg

Sounds even worse seeing on the screen in type LOL! But have to admit that's alot of lead footing too and I'm tuned kinda rich so I could improve if I really wanted to.

 

mild 355ci, T56 six speed, 750 Holley... average 25mpg highway, most I ever got was 27 doing a steady 70mph. Don't know about city because my speedometer doesn't work.

 

The bird was getting 12.5 MPG city, mild cam 350, 600 cfm Holley T5, 3.42 gears. I expect the BB to get 10 city 12 HWY.
The camaro should do at least 17 city, since the guy who had the engine said thats what it did in his FS extended cab auto 4X4. Of course I wont know for sure the comparison between induction type/weight difference for a month or so. Sould be interesting.

 

I think the lowest I have measured it to is 21.2 mpg. That was on a half long trip, but I did some leadfooting and burnouts too, so I guess it could be better with some pure "granny-driving!.

But usually with normal short distance driving, and my usual leadfooting whenever I have the chance, I get about 14,6, and that's the worst I manage to get it too.

Stock, minus cat.

 

13 City and an amazing 20 highway, if I drive the speed limit. I say amazing because this is a 350 with a 4:10 gear. The T5 helps a bunch....so does the new Holley 650 Avenger carb. I know many have maligned this carb but it replaced a 600 and got better mileage and performance. I am really sold on this carb. I haven't taken this to the strip but I am really confident it would turn a 13 second run. I really have nothing to complain about.

 

3 MPG on my 455 hopefuly the ignition system i bought will help some and some crab tuning and timeing adjustment.

 

about 18mpg average w/3.42 gears and T56 engine in sig. (running a little bit rich now)

The el meano' gets 15-18 highway with 33's and a three speed saginaw, some new trucks can't touch those numbers.. figure that one out?

 

Whne my 76 SWB C10 was NA I was getting 14 city and 24 hwy, 350, LT1 cam, 600cfm Holley, headers, Muncie HD 3 speed 3.73's and 275, 50X15's all the way around. With the twins it gets below 10.

 

I get 20-22 mpg on the highway at 70+mph.

Don't even bother with around town, as I'm usually having fun, and not worring about mpg..

My specs are in my sig.

 

18mpg with a combo of 50 miles hiway and 40 city and a couple 0-120 blasts

 

Lots.

86 LG4, open element and exhaust, first 300km ran me like 80 bux in gas...

 

1990 L98 Corvette motor
Ported L98 heads
Accel 219/219 roller
700R4 with 2400rpm converter
3.42 gears
LG4 pieces still in place & functional


About 13 city, 22 highway - averages about 17 or so.

 

1985 Trans Am 5.0 HO with stock carb.

~12 mpg city (I'm a lead foot)

oddly, I get 24 MPG highway during the day and 22 MPG highway at night.

 

15mpg city 20mpg highway

carb tuned, 1inch spacer, stock L69.

headers, no cat,hooker catback

 

12 City, 20 Highway (3.23 rear)

Specs in sig

 

last summer averaged 8 MPG, but there was some heavy driving at least a few times each time I was driving.

With a new build up, ill be getting the carb tuned professionaly
cause i seem to keep it too rich and sometimes too lean
i dont like backfires from the carb... it shoots 3 foot high fireballs
hahaha

 

back fires through the carb normally mean your timing is too far retarded and has nothing to do with your carb.

 

i get about 150 to a tank with like 4 gallons left. stock 1983 305 5spd