21 MPG on the highway - Page 4
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RWD 19xx-1984 DeVille and Fleetwood,
1985-1996 Fleetwood and Brougham Forum Discussion, 21 MPG on the highway in Past Cadillac Vehicle Discussion; Originally Posted by Mr Cowl Hood The LT1 engine's torque peak RPM value is ~4500 so in your world, I ...
  1. #46
    davesdeville's Avatar
    davesdeville is offline Banned
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    Re: 21 MPG on the highway

    Quote Originally Posted by Mr Cowl Hood
    The LT1 engine's torque peak RPM value is ~4500 so in your world, I can drive around at 4500 rpms and save gas?...Oh, I'm sorry, 4499 rpms, then?
    Driving at a really low rpm like 2200 won't do you as much good as you might think it would, and driving over 4500 will kill the mileage. That's all I'm saying. Thanks for reading my post, I guess it's not too much to ask of you after all.

  2. #47
    ocjmakaveli's Avatar
    ocjmakaveli is offline Cadillac Owners Enthusiast
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    Re: 21 MPG on the highway

    Quote Originally Posted by davesdeville
    Driving at a really low rpm like 2200 won't do you as much good as you might think it would, and driving over 4500 will kill the mileage. That's all I'm saying. Thanks for reading my post, I guess it's not too much to ask of you after all.
    PLease stop writing to this thread ...

    regardless, I think a good even LOW rpm properly inflated tires gets the best mpg. oh and the least stops possible. Good temperature air between 40-70 degrees

  3. #48
    HotRodSaint's Avatar
    HotRodSaint is offline Cadillac Owners Master
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    Re: 21 MPG on the highway

    If you want good mileage from a Fleetwood (why buy a FLW if mileage is your concern) just hook it up with some 26" wheels!

  4. #49
    Mr Cowl Hood's Avatar
    Mr Cowl Hood is offline Cadillac Owners Member
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    Re: 21 MPG on the highway

    Quote Originally Posted by ocjmakaveli
    PLease stop writing to this thread ...

    regardless, I think a good even LOW rpm properly inflated tires gets the best mpg. oh and the least stops possible. Good temperature air between 40-70 degrees
    You bring up a really good point about proper tire inflation. That's really key too! Running cruise control can also add some miles per gallon. It seems a smoother gas pedal rather than pulsating the pedal does better.

    So, is this thing dead yet?


    Brian 96 FWB / 96 Impala SS

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