Yeah, it can be tough, (my 15000HD used to get 10 mpg) but before you make any rash decisions on your vehicle choice, do the math:
Based on 15,000 miles per year:
@ 15 mpg = 1000 gallons @ $2.00/gal = $2,000
@ 20 mpg = 750 gallons @ $2.00/gal = $1,500
So, if you drive 15,000 miles a year with gas at $2.00/gal, you save $500 all year. Obviously, if the price goes up, the savings goes up.
While this is not an insignificant sum, its not huge. And what would you have to give up to get the 20 mpg? I bet you would have a lot less vehicle than the crew cab pickup you have now.
Now, I did give my 1500HD back when the lease was up and got a Chevy Colorado. But it wasn't for the gas mileage (although it did improve to 17 mpg). I got rid of it because I actually got 2 Colorados for about the same cost as my 1500HD, 1 for me, 1 for my daughter. ( A 2 for 1 sale @ Chevy!) :hifive:
Anyway, do the math and consider your situation before you do anything drastic. I still miss the big truck as I'm 6'2" 280 lbs but I now have a metallic red and a dark green colorado to fuss over. Both of them look alot better when polished and waxed than the bland grey of the old truck! :spot