if you tow at all go diesel and don’t look back, I tow very often I farm and I have a 2014 ram 3500 now, It’s my 3rd cummins. I have also owned 2 Duramaxs also. I’m not sure if emission testing is a problem where you live but around here we just delete our diesels and never look back. I voided the warranty on mine shortly after buying it and I had a 2010 Cummins before this one and deleted it within a few weeks of buying it also. Diesels run forever if taken care of. I also have a gmc 6.0 gas we use to feed with because the only downside to diesels are they are very heavy and they tend to sink off-road in the winter but as far as fuel mileage I can drive my cummins dually cheaper than the 6.0.