In '07 we bought a new 35' 5th wheel and a new F-250 4X4 diesel to pull it. At that time diesel was significantly lower per gallon than gas.
Of course, almost as soon as I bought the truck the price of diesel shot up to 50 to 60 cents higher than gas.

I recently sold the trailer and traded the F-250 in on a new F-150 4X4. Now I see diesel is selling for 10 cents per gallon less than gas, WTF!