Wellytrack
Member
Whether that 10% would prove correct in real world use I'm not sure, although I do doubt it. If so I would say that particular comparison would be the exception rather than the rule, having compared t6.175, t6.180, t7.170 n154 and t154. the difference in fuel consumption will vary between 4 and 6 pot being more economical depending on the exact tractors you are comparing, the difference in internal losses between a 4 and 6 is negligible, the only time a 6 might use more is at idle, and that is due to the displacement not the number of cylinders. With modern 4 pots getting bigger displacements this difference disappears anyway. All this aside, a 4 will never be as smooth as a 6 due to fires per revolution.
Have a read yourself. Fuel consumption difference of 3 - 7% like for like.