Question about 1997 Dodge Ram 1500 Club Cab

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1997 Dodge Ram 1500 4WD 5.9, Changed tire size from 265 to 315.

Gas miliage with 265 tires, was 15 MPG. Changed out front/rear ratios from 3:55 to 4:10, hopefully to make up for larger 315 tire size and calibrated Speed Sensor to match 315 tires. Installed 315 tires and GM went to 13 MPG. Installed 3" body lift. Changed out PCM and for the first 32 miles, GM up to 15.5 MPG. Reset odometer, refueled after another 32 miles and GM back to 13 MPG. Found partially blocked CAT and had same as well as muffler changed out to 3" exhaust system. Reset odometer and refuled after another 32 miles and miliage up to 17 MPG! No, ****! I'm at a loss as to what has happened other than spending a lot of money and time for nothing. What did the 3" exhaust have to do with the 17 MPG or the PCM with the 15 MPG? Truck looks good, but WTF!

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  • Lairbear
    Lairbear May 31, 2009


    Stock, rebuilt from Dodge. I returned the old one for credit.


  • Lairbear
    Lairbear May 31, 2009


    Stock, rebuilt from Dodge. I returned the old one for credit.

    It has the newer programs installed. Plug and Play.

    I had the miliage and VIN programmed in by the local dealer.



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  • 4,669 Answers

The better the engine breaths the better the mileage. Was the new computer a stock computer or performance?

Posted on May 31, 2009

  • Clint Smock
    Clint Smock May 31, 2009

    The new program must included a fuel trim or timing curve change that effected mileage.


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