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how many miles per gallon?

This is a discussion on how many miles per gallon? within the C10 Forum forums, part of the General Discussion category; I was wondering how many miles per gallon you get with your carberated 350 engine. How many miles per gallon ...

  1. #1
    My chevy bangin mike11743's Avatar
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    how many miles per gallon?


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    I was wondering how many miles per gallon you get with your carberated 350 engine. How many miles per gallon do you think a rebuilt carberated 350 would get.

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    Re: how many miles per gallon?

    In a full size truck, it is possible to get about 15 -16 mpg with a well tuned carbed 350. Most get a lot less.

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    has no car payment! TIMSPEED's Avatar
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    Re: how many miles per gallon?

    Quote Originally Posted by mike11743
    I was wondering how many miles per gallon you get with your carberated 350 engine. How many miles per gallon do you think a rebuilt carberated 350 would get.
    I get like 15mpg right now, doing 65mph on the freeway. I have a 355cid/Th350/3.42/28" tire. I plan to swap in a 700r4 for the Th350, and hope to jump up to 20-22mpg on the freeway.
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    Re: how many miles per gallon?

    Quote Originally Posted by TIMSPEED
    I get like 15mpg right now, doing 65mph on the freeway. I have a 355cid/Th350/3.42/28" tire. I plan to swap in a 700r4 for the Th350, and hope to jump up to 20-22mpg on the freeway.

    You will never gain that much mpg with that tranny swap. I would be surpised if you get more than 2 mpg. A carbed SBC does not get 20 mpg in a full size truck.

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    The Poorest High Roller timamin's Avatar
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    Re: how many miles per gallon?

    I get about 5 mpg :-x don't get a holley 750 :-D
    Last edited by timamin; 08-21-2005 at 09:40 AM.
    '72 custom 20
    chevy 400 Race mod'd holley 750 carb.( R.I.P. broken cam crank and anything else u can name bottom end lol)
    custom th350 B&M shifter and kit's.
    *soon* 383 stroker, yet to decide boost or NA.

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    Re: how many miles per gallon?

    I get about 9-11 city and highway depending on how much time is spent where and how often I floor it. It's a 94' 350 with a Holley 650 I think. I'm looking to downsize to a 600 or 570 for some more economy. I also have 31's and a Th350.
    Correction after doing some more math the other day I realize I get more like 7-9 MPG. I wish it was like 9-11.
    Last edited by Bigdrumma22; 08-28-2005 at 08:06 PM. Reason: correction
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    Re: how many miles per gallon?

    Quote Originally Posted by Black Dog
    You will never gain that much mpg with that tranny swap. I would be surpised if you get more than 2 mpg. A carbed SBC does not get 20 mpg in a full size truck.
    You know..you're probably 100% correct..in our 91 FSC with the TBI 350 and 700R, it gets BEST of 17mpg (doing freakin 65!) SOOO...I may just leave the th350 in it...
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    Unhappy Re: how many miles per gallon?

    After doing some more fun math, I realized I get more like 7-9 MPG, not 9-11 like originally posted. I wish it could be that good.
    1984 K10 Scottsdale, 350/TH350, Edelbrock AVS O/R 4Bbl, K&N, Flowtech Ceramic LT's, Dual 2 1/4" exhaust, Dynomax Super Turbos, MSD 6AL, Accel Billet Distributor, 31X10.50 Falken Rocky Mountain A/T's, PIONEER DEH-33HD, GM-X362 & TS-A1304C comps, GM-D510M & 2 TS-SW124D's, and more to come

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    Re: how many miles per gallon?

    with my tbi 454, I get about 8.5 city, 8.5 highway.


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    Re: how many miles per gallon?

    Quote Originally Posted by Black Dog
    You will never gain that much mpg with that tranny swap. I would be surpised if you get more than 2 mpg. A carbed SBC does not get 20 mpg in a full size truck.
    My Q-Jet carbed bolt-on 305 would get 13-15 in town and 18-20 on the highway in my G20. With a much too large Comp XE274 the 305 got 12-14 around town and 18-20 on the highway, but had alot more power. My 305 headed 355 got 14-16 around town and 18-21 on the highway when carbed. With TBI it did slightly better. My later TBI engines are better than that.

    Current is a .040" over 305, LB9 305 tpi heads, stock 305 HO cam, headers, stock TBI intake, stock 350 TBI, 4.3 injectors, GM VAFPR, custom chip. It is getting 17-19 around town and 21-23 on the highway.

    Over the last 20,000 miles and 5 different engine combinations, I have gotten 18 mpg as an average. NO

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    Re: how many miles per gallon?

    tranny and gears makes a huge difference. i had a stock 305 in a 2wd shortbed with a very well tuned quadrajet, 700r4 and 2.73. i got a best of 23mpg on a trip. then went to a 268 cam, th350 and 4.10's and it dropped to 11 on a trip. now i have a 350 with a 750 carb, th350, and 3.42, and i would guess around 13 so far, but i haven,t really driven it far enough to get a better #
    Last edited by chevydad; 08-31-2005 at 12:29 PM.


    83 chevy- 13.58@99(carbed 350 vortec with stock lt1 cam)350 is for sale- getting a 6.0 swap
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    Re: how many miles per gallon?

    I don't ever believe peoples mileage claims on the internet, especially when they are out of line with what every other owner of similar vehicles reports. Show me a spread sheet showing your fuel consumption/mileage averaged over at least six tanks of fuel, and I might believe you.

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    Re: how many miles per gallon?

    15 MPG city, 20 Highway, 17 combined was the window sticker on a 1985 Chevy G20 carbed 305 4bbl model with a 4spd auto. Mine is a super tuned version, using highway mode, fuel injection, 3.08 gear, etc.

    http://www.fueleconomy.gov/feg/findacar.htm

    The 1988 TBI 5.0 is listed at 15 mpg city, 20 mpg highway, and 17 mpg city. Exactly the same. Free up the intake, port the heads, turn on highway mode, use smaller injectors under more pressure for good atomization, tune for fuel economy and you see where you go. 23 isn't that unbelieveable.

    I get 500+ miles a tank in the city and about 750 on the highway from a little over 30 gallons. My tank is at most 34 gallons so you do the math. My odometer is dead-on(I have calculated the RPM at various speeds and they exactly match what my speedo is saying and I go 1 mile on the odometer for every mile on the milemarker).

    My last trip was 767.8 miles on 32.8 gallons of gas. Do the math! 23.40 MPG with the A/C on and the cruise set at 75. 75 MPH is 1850 RPM with my gearing, on level ground I run at about 1,800-1,900 RPM, 55-65 MAP, 18-25% TPS and 15.7:1 air fuel ratio.
    Last edited by Fast305; 08-31-2005 at 06:49 PM.

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    Re: how many miles per gallon?

    what about a stock 305??
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    Re: how many miles per gallon?

    Quote Originally Posted by 85 305
    what about a stock 305??
    Before the recurved distributer and the duals it got about 13 mpg on a regular basis. After it got 17+.
    Last edited by Fast305; 08-31-2005 at 09:16 PM.

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    Re: how many miles per gallon?

    4wd Tahoe
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    3.73 gears = 11 mpg

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    Talking Re: how many miles per gallon?

    '82 C30 2wd dually with '79 400 sb, 4-spd sm465 tranny, Q-jet, 4.56 gears, no egr or air pump, gets me a whopping 8 mpg city or highway, empty or
    loaded. With my single 20 gallon tank that sure gives some great range on a
    $3 + per gallon fillup ! Yikes !!!

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    Re: how many miles per gallon?

    6" lift. 35's. 4.10s. open cats. 11mpg hiway. 13 fwy.

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    Re: how many miles per gallon?

    65 elco 355 muncie 4spd 373s 8mpg if im easy
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