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Just read an article from Cummins. It was 32 pages long and discribed the critical factors in getting better mileage from a truck with a Cummins engine. Their main point was that below 50 mph there is more rolling resistance that aero drag. Above 50 mph the air drag is a greater source of restance. Worn tires get better mileage. Ribbed tires get better mileage than cross treads. It is essential to inflate the tires to the safe maximum as every 10 psi low can cost a 1% loss in economy. The best truck drivers get 30% better mileage than the worse drivers. Just use the cruise control and you will beat the average.
Randy
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