I just bought a 2003 dodge cummins 4x4 crew cab 6 speed. With the scan gauge showing tps at 17 I got 10.9l/100 average on big hills with a 12 ft boat hanging out the back and the back seat loaded with gear. Once the road leveled off I got down to 9.5, that's with a 80km speed limit and doing roughly 95 for 8 hours. The truck also has a bullydog program on the lowest setting. Haven't had a chance to try long distance driving since.
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