Yes saving money on fuel is a big deal. If you think about how much extra you spend just on premium a year, it could easily be five to $800. Personally that’s why I searched out a Duramax. It was actually a discount, engine wise, and gets 40% better mileage. I fed a premium hog for years. (5.7 Hemi )…it was a 100.00 a wk habit. I didn’t care when premium was plus $.30 over regular unleaded. But now in many areas it’s plus $.60-$.80…that’s extortion. Diesel is higher than regular, about even with mid grade, but still far less than premium at least where we are…