I've been debating the gas vs diesel thing lately. I have an '06 Duramax Van with fairly low miles (99k) and tow fairly light (wakeboat, utility trailers, etc). GF has a '12 Ram Cummins that we use to tow heavy (Toyhauler, gooseneck with skid steer, etc).
Talking a good friend who owns both gas and diesel versions of the same truck (2012 Ram), he prefers the gas. He tows a big 5th toy hauler, not sure of actual weight, and says that he prefers the gas truck more and that it's towing mileage isn't much worse than the diesel. His opinion is that the gasser has plenty of power, and he drives pretty fast.
This is similar to another friend who was a big diesel fan. His input was that the diesel is great until the EGT's get real high while towing up big mountains. He prefers his gasser motorhome to his diesel truck towing the 5th wheel.
I bought my Duramax for the fuel mileage. It's been pretty good overall, but there are several things working against diesel's these days:
- The EPA cracked down on deletes and mods a year or two ago. Good luck finding delete kits. Tunes may be affected to.
- The cost of a diesel engine on initial purchase is high. That pays for a lot of gas.
- Maintenance: Oil changes, fuel filters, etc adds up.
- Cost of fuel. Diesel is a good more expensive than regular gas, has been for quite a while now.
- DEF. While the fluid isn't necessarily expensive, the system is if it needs repair. This is why the '12 Ram's seem to be the sweet spot.
- Extra battery to replace, can be hard starting in the cold (I've never had an issue with my Duramax in below 0 weather without it plugged in, but am told the Duramax is the exception...not sure).
- Noise, although most new trucks are pretty quiet inside these days.
- Long term repair. This is a biggie! Injectors, injection pumps, head gaskets, etc can be ridiculous to repace!
- Unlikely to run veg oil or homemade biodiesel in any newer engine without major issues. Leave that to the old engines.
- Turbo maintenance/replacement/repair...
- Weight. They are heavy, and can tear up front ends, make it harder to get thru sand/mud, etc.
- Diesels don't like to sit (been told this over and over). Not really sure what to think about this... they don't like short trips for sure.
No doubt the torque out of a diesel is nice to drive, but the transmissions seem to hit and miss. The Allison has a great reputation on a stock truck. Depends on the 6sp in the Ram, there were two offered IIRC.
Please don't misunderstand, diesels can be great, but the EPA has really made them much less attractive the last 10-15 yrs. I'd love to tow heavy with a newer gasser to really see how they do. The difference in purchase and maintenance costs can pay for a lot of gas, if it's even more expensive given the price difference of the fuel.