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500, 472, 425, 368 Discussion, mileage in Cadillac Engine Technical Discussion; Hi, I have a 1980 cdv, 46000 miles,368 cu.in. just had carb, professionaly rebuilt ( show car standards) about 3 ...
  1. #1
    creeker is offline Cadillac Owners Connoisseur
    Automobile(s): 1992 eldorado. 2007 dodge magnum hemi r/t
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    mileage

    Hi, I have a 1980 cdv, 46000 miles,368 cu.in. just had carb, professionaly
    rebuilt ( show car standards) about 3 mos. ago, does anyone know what kind of gas mileage I should be getting, it seems to guzzle gas like it's going out of style,I'm not a lead foot either, also have a new k&n filter,plugs,rotor
    and plug leads.
    Tnx Ken

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  3. #2
    CadiJeff's Avatar
    CadiJeff is offline Cadillac Owners Connoisseur
    Automobile(s): 1981 CoupeDeville, 2 1990 Eldorados, 1994ETC ,1992STS
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    Re: mileage

    my 81 cdv has EFI but I get 15 in town and 23 hwy

  4. #3
    472's Avatar
    472
    472 is offline Cadillac Owners Fanatic
    Automobile(s): 55 60S, 81 DeVille (Diesel), 83 Coupe (507), 84 Wood (425)
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    Re: mileage

    Man, that's a tough one. My best educated guess would only be about 10-12 city, and 14-17 highway. It wouldn't suprise me if stock specs were higher, and someone may chime in with better, but in my experience - gas goes bye bye. My 1979 Coupe Deville (425) got like 6+ city, and 12 or so highway, and my 1979 Bonneville (301 4bbl) gets about 8 city, and about 16 highway. Lastly, my 1983 Coupe with a built 507 and locked 3.42's gets better than the 425 or 301 (not working as hard [bogging]) if I keep the pedal off the metal. MPG is circumstantial to too many things to lay it on paper accurately

  5. #4
    caddydaddy's Avatar
    caddydaddy is offline Cadillac Owners Connoisseur
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    Re: mileage

    My '79 Deville with the stock 425 got as high as 17 mpg on the highway. The smaller 368 should get at least that.

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