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Author Topic: 99 Chieftain Diesel MPG & Speed  (Read 1224 times)

drbkeele

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99 Chieftain Diesel MPG & Speed
« on: October 24, 2009, 01:37:12 PM »
I recently purchased a 99 Chieftain diesel.  Has anyone determined what is the best speed for the most MPG?  So far, I have driven between 60 and 65 and get a little better than 10 MPG.  However, I find it shifts down into fifth gear fairly often.  RPM at that speed is about 1750.  Anyone experimented with this?

 

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