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  1. stevehhll

    Cummings Performance Variation based on Transmission

    I had an '03 5.9 with the 6 speed manual. The output shaft from the xfer case was a common problem - it couldn't handle the torque. That might be why the manual xmission on the 6.7 is detuned. I definitely lost a lot of fuel economy - going from 20 mpg to about 16 mpg with my new truck. I'm...
  2. stevehhll

    Does 87 octane vs 89 octane really make a difference?

    My old commute used to include a long hill that my manual xmission DD would sometimes not make without disconnecting the CC due to speed decline. I checked it literally hundreds of times with different octane fuels. With premium it would not make it as far up the hill without kicking out the...
  3. stevehhll

    Tires, Tires, Tires???

    Here's the engineering solution for optimizing ride comfort, tread wear, fuel economy, and traction. The sidewall lists the maximum load at the maximum pressure. The actual weight on the axles should be lower than that. Weigh it at a scale if you're not sure - one axle at a time. If you're...
  4. stevehhll

    Tires, Tires, Tires???

    Ahh yes - cost/benefit ratio vs. budget. Very seldom do they give the same answer. The Michelin LTX A/T 2 has a projected life of 85,000 miles by Consumer Reports, and has been redesigned as a low rolling resistance tire.

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