500 mileage?
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500, 472, 425, 368 Discussion, 500 mileage? in Cadillac Engine Technical Discussion; I was wondering what kind of mileage I could expect from a '74 500 with a mild cam, edelbrock intake, ...
  1. #1
    daredeville is offline Cadillac Owners Member
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    500 mileage?

    I was wondering what kind of mileage I could expect from a '74 500 with a mild cam, edelbrock intake, headers/dual exhaust, HEI, in a 3700lb. car w/2:73 gears

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    lux hauler is offline Cadillac Owners Connoisseur
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    Re: 500 mileage?

    Just a guess but I'd say 10.....maybe 12 if your foots not buried too deep.

    I've heard people say that they've squeezed 15 outta one of these motors. Either they're lying or they're not enjoying it.

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    DaveSmed's Avatar
    DaveSmed is offline Cadillac Owners Connoisseur
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    Re: 500 mileage?

    Quote Originally Posted by lux hauler
    ......if your foots not buried too deep.
    Damn that little disclaimer....

  5. #4
    Ralph's Avatar
    Ralph is offline Cadillac Owners 10000+ Posts
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    Re: 500 mileage?

    For a baseline comparison, my Dad used to get 9 or 10 with his 455 cu. in. 442 Olds. My friend who has a Dodge Ram with the 5.9L 360 (2002) gets 8 or 9 (city). But trucks are geared differently or higher than cars right? I could squeeze 12 out of my 383 Charger. I would guess not much worse than this. Oh, I'm getting 19 or 20 city (winter!)

  6. #5
    daredeville is offline Cadillac Owners Member
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    Re: 500 mileage?

    thanks, I'm hoping the torque advantage will far outweigh the mileage disadvantge. I kinda figured I'd be able to pass everything but the gas station. Should be fun though

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    German_472 is offline Cadillac Owners Member
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    Re: 500 mileage?

    Quote Originally Posted by daredeville
    thanks, I'm hoping the torque advantage will far outweigh the mileage disadvantge. I kinda figured I'd be able to pass everything but the gas station. Should be fun though
    Hi,
    in the attachment, you will find my gas mileage for the last year. I keep a book on getting gas. The most right list shows you the mileage per 100 km - you will have to convert this, since it is Liters for 100 km. It does convert to miles per gallon somehow. 20 miles per gallon is about 9-10 liter per 100 km.

    The mileage is for the stock vehicle, running a 472 engine on the TH400 3 speed A/T, with 1" carb spacer and flowmaster muffler. Other than that, its stock, but the carb seems to be somewhat out of tune. I mostly cruise at 55 to 65 mph.

    Hope it helps,
    Andreas
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