Gas Mileage of the 500
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500, 472, 425, 368 Discussion, Gas Mileage of the 500 in Cadillac Engine Technical Discussion; I have recently fallen in love with the look of the 69 - 70 Eldorados. I can only imagine the ...
  1. #1
    1stgenbird's Avatar
    1stgenbird is offline Cadillac Owners Member
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    Cool Gas Mileage of the 500

    I have recently fallen in love with the look of the 69 - 70 Eldorados. I can only imagine the power of thr 500 must be impressive. Can anyone tell me what the typical gas mileage is with that engine? When I was a teenager, my parents bought a new '69 Calais which had the 472 but in those days no one cared about MPG too much and I don't recall what that car got.

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    blue71eldo is offline Cadillac Owners Member
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    Re: Gas Mileage of the 500

    Not positive about the 69-70, but I have a 71 which gets about 13 on the highway and 9 in the city...and 4 gallons to the mile in a parade.

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    jk1000 is offline Cadillac Owners Member
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    Re: Gas Mileage of the 500

    It seems, in my experience, that miles per gallon is not the best way to describe fuel consumption. But rather, minutes per gallon. If you compare the minutes it takes to burn up a gallon of gas on the highway, you'll see some similarity to the minutes per gallon in city driving.

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    Re: Gas Mileage of the 500

    i get 9mpg in the city and 14 highway or better if i keep it under 60mph with my 1976 hearse (fleetwood 75)

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    JTraik is offline Cadillac Owners Enthusiast
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    Re: Gas Mileage of the 500

    I drove back from Iowa with my '68 and got about 15 or so... the secondaries were stuck though i think haha. I havent driven her in some time so i cant give you a recent calculation.

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    Nick Campagna is offline Cadillac Owners Member
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    Re: Gas Mileage of the 500

    Got a box stock 76 Eldo, 15.3+ on open road, 13.5 around town.

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    Re: Gas Mileage of the 500

    Quote Originally Posted by Nick Campagna
    Got a box stock 76 Eldo, 15.3+ on open road, 13.5 around town.
    I dunno about that...

  9. #8
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    Re: Gas Mileage of the 500

    So about 9 around town is average for a mid '70s 500? and about 14-15 highway is normal?

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    Re: Gas Mileage of the 500

    I doubt you'll see 13.5 around town unless you are being towed...
    15 highway is realistic however. I see 15-16 in pure highway driving with the cruise on and ~12 in mixed driving (roughly 50/50) in my '70 SDV.
    Just be sure to give it a proper tune up, keep the tire pressure up, and don't drive like a maniac (all the time)
    When setting the idle, be sure to do the factory-prescribed lean-drop idle setting. That will make a difference in mileage. Switching the vacuum advance to full-time, full-manifold vacuum will help you around town also, but I'd change the vac cannister to a unit that gives less total advance, or an adjustable one. If you have the vac advance like this, you've gotta remember to disconnect and plug it when setting timing.
    Also, buy a dwell meter, you'll need it to properly tune up the points distributor. Always reset the base timing after changing the dwell.

    Oh, yeah, and if you want a 500 under the hood, don't get a '69 - they "only" had a 472, but at least it's a high-compression motor.

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    steinec is offline Cadillac Owners Member
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    Re: Gas Mileage of the 500

    I get about 8mpg around town with my '70 500...

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    Re: Gas Mileage of the 500

    Quote Originally Posted by steinec
    I get about 8mpg around town with my '70 500...
    Hey just think, some guys get like 11-13 mpg with their brand new 4x4's with small V8's in them.

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    JTraik is offline Cadillac Owners Enthusiast
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    Re: Gas Mileage of the 500

    Quote Originally Posted by I~LUV~Caddys8792
    Hey just think, some guys get like 11-13 mpg with their brand new 4x4's with small V8's in them.
    Our '05 Excursion gets a solid 12-14 highway with a v10 6.8L. Its got some power though.

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    Re: Gas Mileage of the 500

    Quote Originally Posted by JTraik
    Our '05 Excursion gets a solid 12-14 highway with a v10 6.8L. Its got some power though.
    That's pretty solid!

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    Re: Gas Mileage of the 500

    Quote Originally Posted by JTraik
    Our '05 Excursion gets a solid 12-14 highway with a v10 6.8L. Its got some power though.
    Whats the city MPG? I dont mean anything bad by this, but I'm curious

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    JTraik is offline Cadillac Owners Enthusiast
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    Re: Gas Mileage of the 500

    Quote Originally Posted by The Ape Man
    That's pretty solid!
    Touche! Ok a solid 13.

    Quote Originally Posted by I~LUV~Caddys8792
    Whats the city MPG? I dont mean anything bad by this, but I'm curious
    Im pretty sure it gets about 8 or better with pure city driving. I think its a very efficient engine considering, its 4x4 and weighs in at 7800 lbs. She can move too! Still think the diesel would have been better.

    Another cool thing about these v10s is that when they overheat a few cylinders shut down and act as pumps, pumping cold air through the block somehow! Im no Ford guy but thats pretty neat... for all i know though, several vehicles probably have that feature.

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