MPG on carb'd 308's? | FerrariChat

MPG on carb'd 308's?

Discussion in '308/328' started by dstacy, Jul 8, 2006.

This site may earn a commission from merchant affiliate links, including eBay, Amazon, Skimlinks, and others.

  1. dstacy

    dstacy F1 World Champ
    Owner Rossa Subscribed

    Jan 23, 2006
    11,998
    GMT -5 & GMT +1
    Full Name:
    Dave
    Just wondering if you'd let me know what kind of gas mileage you're getting on your 308 with carbs.

    Thanks.
     
  2. DavidDriver

    DavidDriver F1 Rookie

    May 9, 2006
    4,424
    Grass Valley, CA
    Full Name:
    David Driver
    15-17 un-tuned, on an balanced '77 GT4 with approx. 80K miles.

    Hopefully it will be better after I've gone though it.
     
  3. Mike328

    Mike328 F1 Rookie

    Oct 19, 2002
    2,655
    Boulder, CO
    Full Name:
    Mike
    My old 308 got 9 to 12 overall, depending on how lean/rich the carbs were tuned.

    15 to 17 on the carb car seems incredibly high to me, unless you're doing pure highway driving. That's better than 328s get combined city/highway (I got overall 14 MPG over just under 3000 miles).
     
  4. 308GTS

    308GTS Formula 3

    Dec 27, 2001
    2,223
    TN
    I think 10 is realistic for around town. I have driven mine for 7 years and 10 is about right even after I rebuilt the carbs and upgraded to electronic ign. while rebuilding the dist.
     
  5. FourCam

    FourCam Formula Junior

    May 19, 2004
    409
    Loveland CO
    Full Name:
    Cameron MacArthur
    Out here in the wild, wild west, at a CONSTANT 75-80 highway I see 18mpg all the time; crank it up to 90-110 ( out in the open, obviously) it drops to about 8-10 and you need a pit stop about once an hour! Around town I usually figure about 11-12 but it is hard to know for sure as I try to do as little in-town driving as possible...these cars hate in town driving anyway...('79 308GTS)
     
  6. wise3

    wise3 Formula Junior

    Oct 10, 2004
    375
    FL
    Full Name:
    Ward Orndoff
    desmogged 77: 17 highway, 10-14 around town, 7 on the track.
     
  7. DavidDriver

    DavidDriver F1 Rookie

    May 9, 2006
    4,424
    Grass Valley, CA
    Full Name:
    David Driver
    Yes, that's hwy driving. That's what I got driving the car home to Los Angeles, from Oregon. I haven't had a chance to do much around town driving yet, because I haven't had it long enough to figure out the mileage.

    I know my friend from Oregon has an '88 Mondial 3.2, that got 20-21 on the hwy up to Oregon and back, when we took his up there so he could register it.

    It's just coincidence that the car I bought (off eBay) was only 2 blks away from the Medford DMV, and I ended up going there twice in 3-weeks.

    Two great drives. And made for a great comaprison. His is smoother and quieter, with better gas mileage. Mine is more fun. WAY more fun!!!
     
  8. Andy 308GTB

    Andy 308GTB F1 Rookie
    Lifetime Rossa

    Jun 2, 2004
    2,667
    Essex, UK
    Full Name:
    Andy M
    Obviously mine is a Euro-spec car but I certainly get above 15mpg.
    I have always estimated mpg to be around 18-22mpg on a reasonalbe run.
    Next time I fill her up, I will zero the mileometer and report back with my results.

    It's a good job my 308 is not too thirsty with these prices
    Leaded Petrol in the UK is
    GBP 1.37 a litre
    GBP 6.20 a Gallon
    USD 11.50 a Gallon (@1.85)

    Unleaded Petrol is a tad cheaper (USD 8.30 a Gallon) but I prefer to stick in the poisonous stuff :D
    Also, of course our Gallon is being than yours (so there...)
     
  9. LightGuy

    LightGuy Four Time F1 World Champ
    Silver Subscribed

    Oct 4, 2004
    45,623
    Texas
    Full Name:
    David
    For a 3 litre, they are fuel sucking pigs. Think more; Smiles per Gallon.
     
  10. greg328

    greg328 F1 Rookie

    Nov 17, 2003
    4,209
    Austin, TX USA
    Full Name:
    Greg
    My 1977 GTB averages 10 mpg...

    Sucks, but it's worth it, especially for a part-time car..

    Greg
     
  11. RAMMER

    RAMMER Formula 3

    Feb 20, 2004
    1,187
    Miami
    Full Name:
    Rammer
    I get 12-14 mpg on my 1976 glass 308 gtb. Its not a frugal engine as it loves to rev! On highway its always at 3500-4500 rpms......its hard to get good mpgs at that rpm. I am thinking of trading it in on a hybrid......
     
  12. Steve King

    Steve King F1 Rookie

    Feb 15, 2001
    4,367
    NY
    17 on the open road (60-80 mph) and 10 around town because we all like to drive in 2nd or 3rd . Just love the sound and screw the mileage. Enjoy the ride
     
  13. BobH

    BobH F1 Rookie
    Silver Subscribed

    Nov 8, 2003
    3,157
    Morristown, NJ
    Full Name:
    Robert H
    1977 desmogged GTB. Tubi exhaust I see 10 - 12 mpg on average. I have never seen the high teens mentioned by some others mention but it could be zeal with which we drive.
     
  14. Birdman

    Birdman F1 Veteran

    Jun 20, 2003
    6,689
    North shore, MA
    Full Name:
    THE Birdman
    I get around 12 in a '77 GTB on average, up to as much as 15 on the highway, and I get around 15 (mostly around town) in a Mondial QV but that creeps to 18 on the highway.

    But who cares? That is the LEAST of the operating expenses for the car.

    Birdman
     
  15. Mike328

    Mike328 F1 Rookie

    Oct 19, 2002
    2,655
    Boulder, CO
    Full Name:
    Mike

    Well, you SHOULD care. It's not a financial thing. It's important to compare mileage to ensure that your engine is in a proper state of tune (i.e., your carbs are way too rich if you're only getting 8 MPG). At the same time, the people reporting 15+ around town in a carb 308 may not be calculating their mileage correctly (or drive very conservatively or are running inappropriately lean).
     
  16. chrismorse

    chrismorse Formula 3

    Feb 16, 2004
    2,150
    way north california
    Full Name:
    chris morse
    Desmogged 77 8 mpg town and 15-16 trips. Love to hear the carbs howling.

    chris
     
  17. buckminster

    buckminster Formula Junior

    Aug 18, 2005
    989
    On the water, SWFL
    Full Name:
    Nicholas Raftis
    14 to 16 overall, tuned up and driving fast.
     
  18. johng

    johng Formula 3

    Oct 23, 2004
    2,298
    northern va
    Full Name:
    john g
    around 12-13 combined city/highway. stock 78 GTB.

    john
     
  19. yank05

    yank05 Formula Junior

    Nov 8, 2003
    272
    New England
    Full Name:
    Anthony
    '76 GTB (steel).....never calculated city mileage, but consistently get 16 mpg on highway trips....

    Anthony
     
  20. snj5

    snj5 F1 World Champ

    Feb 22, 2003
    10,213
    San Antonio
    Full Name:
    Russ Turner
    mid-teens on a carb'd heavy ass Mondial
     
  21. Birdman

    Birdman F1 Veteran

    Jun 20, 2003
    6,689
    North shore, MA
    Full Name:
    THE Birdman
    Or more likely, the odometer is inaccurate.
     
  22. 308 GTB

    308 GTB F1 World Champ
    Rossa Subscribed

    Feb 7, 2002
    11,720
    New Jersey
    Full Name:
    Barry Wolinsky
    17 mpg highway (1976 Fiberglass)
     
  23. JTranfield

    JTranfield Formula Junior

    Dec 29, 2003
    665
    NYC, London
    Full Name:
    J Tranfield
    About 15 on average in a 77 carb.
     
  24. Ken

    Ken F1 World Champ

    Oct 19, 2001
    16,078
    Arlington Heights IL
    Full Name:
    Kenneth
    You have a Mondial with carbs?? This must be an interesting story.

    Ken
     
  25. Perfusion

    Perfusion F1 Rookie

    Oct 16, 2004
    4,151
    Marietta, GA
    Full Name:
    Aaron
    Haven't calculated it, because I honestly am not sure I want to know... Whatever it is, 'tisn't good...
     

Share This Page