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by dieselfool on August 8th, 2006
With the new engines such as the Caterpillar Acert and the Cummins ISX, both over 450 hp, I would say an average of 5-6 mpg. But I've seen as good as 8 mpg and as poor as 4 mpg. It depends alot on idle time and terrain. A tractor that is pulling alot of mountain terrain and off road is likely to have lower mpg than that of a truck that is on level highway all the time.
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