md2lgyk, I agree I should get better mileage. On my last trip, granted it was through the hills of Pennsylvania & West Virginia, I only average 6.7 mpg while towing. I have done as well as 8-9 mpg, but normally that's when I don't have to pull the hills. On a daily basis, not towing, I get about 13 mpg. The best I've ever done is 18 on the open road, but again, not towing.
BigD9, you ( or should I say your wife) have a good point. I have tried to keep that in consideration as well.
I guess I am still leaning towards a diesel at this point. My thoughts are that even though it may be more than I need I would rather be over powered than under powered. Even though I don't have any plans in the works right now, I would like to get a new (bigger) trailer someday.
The costs are more, but at least a portion of them are made up through improved mileage and (hopefully) a high re-sale/trade in value. That added to the conveniences when towing (more power, less fuel stops, etc...) will hopefully make for a good decision on my part.