I usually get 5,000 miles every change on my 8.1L BBC ....
Gas Engine Advantages:
Cheaper to buy, cheaper to fix, cheaper to operate (in all but heavy, continuous towing conditions).
Case in point, the company I work for operates a fleet of 150+ 3/4-ton and 1-ton trucks .... All oilfield trucks
We've completley phased out diesel trucks in our fleet due to the horrendous capital costs of buying trucks with diesel motors and automatic transmissions (nearly $10,000 more than a gas truck these days).
I've seen the service record trends, costs, etc for several fleets of trucks, and ____YOU ARE NOT SAVING MONEY BUYING A DIESEL_____ ......
UNLESS you have 10,000-lbs you're hauling around with it EVERYWHERE you go.
I have yet to see any proof that diesel trucks are less expensive to buy or operate in anything BUT that condition. I also have yet to see any proof that the current crop of diesel motors are any more reliable than the current crop of gas motors are .... in fact, I've seen the opposite.
Diesel Engine Advantages
The two big advantages to buying a diesel are power and range. The current crop of diesel motors flat out put the power down, no questions about that. For the amount of power they produce they do get better fuel economy, which when taking into account the added cost of buying a diesel and additional fuel cost is _NOT_ paying for itself. It is however, pretty damned nice to have a 650 ft-lb towing rig in the mountains .... IMO, that's the only real advantage to buying a diesel ..... they are better tow vehicles, primarily because they just put out so much power and they do get slightly better fuel economy than a comparable gas motor, so you get more range out of the same volume of fuel ....
Like I said folks, I've done some pretty serious financial analysis on fleet truck usage, and I cannot for the life of me see where anyone is "saving money" buying a diesel truck for personal use if we can't even see a real cost benefit to using them for fleet service....
But, with that said, my next truck will for sure be a diesel .... I love my BBC and have no trouble towing a 5,000-lb trailer around the mountains with it, but you can't get them anymore .... and it is nice to have that diesel power .... I guess I'm just gonna have to fork over the cash for it