New diesel trucks are pricey, but you can get a good deal on the used ones. I have been looking at new mid-size and 1/2 ton pick-ups and really not that impressed. A new Nissan Frontier or Dodge Dakota will run in the high 20's(x $1000) and still get less than 20 mpg. The 1/2 tons are worse, my buddies Dodge 1500 w/ Hemi only averages 14mpg (combined city and freeway). A Dodge 2500 w/ the Cummins will get over 20+ mpg(highway) with the right diff. gearing( 3.73 diff. will give good fuel economy, the 4.10 diff. will limit you to about 17-18mpg). An oil change cost more, but really the only 2 things that go bad on a diesel are the injectors and fuel pump. On a gas motor you have a whole ignition system(spark plugs, plug wires, ign module, cam position sensor, coil) and the extra sensors(IAT,MAP,TPS,etc.) that have to do with fuel/air ratios(not a problem on diesels). There are trade-offs, and yes it comes down to what you want/need. But until the auto makers can make a V-6 that gets better gas mileage than the V-8, or a V-8 that gets better mileage than a diesel, I will think of the diesel as an option.