OP's topic: 350 HP ICE vs. 350 HP Diesel?
My challenge, that Daveinet bastardized with his souped up dragster camouflaged as a motorhome, is this:
Get a 400 c.i./400 HP (I'll even give you 20 HP advantage) gasoline powered truck with a 35 gallon fuel tank, total GVW of 25,000 lbs. pulling a gooseneck loaded trailer. On a 1,250 mile trip, with a 50 mile head start for the gas powered pickup, cruise set at 65 mph, from the I-81 PA/MD border to Fayetteville, AR, I will beat it to the end of the trip by at least one hour.
I don't care about torque, horsepower, gearing, RPMs, etc. - I care about an apples to apples comparison excluding the fuel type. The diesel will win every time.