Just curious to why....? I considered Diesels many times, but then I think of the troubles of getting it started again if I ran it out of fuel.... Having to carry jugs of gas for the smaller mowers, and jugs of diesel for the big mower.... Diesel fuel costs more than premium gasoline around here.... The mower itself costs considerably more to buy..... I know diesel engines are supposed to last alot longer than gas, but as cheap as these gas engines are to just simply replace if needed, I think you would come out cheaper overall with gas over diesel once the diesel is worn out.... right? Also seems like the mowers themselves are pretty beat by 3-4 thousand hours anyway, and I have heard of the gas engines common on ZTRs going that long with regular oil changes....????