In my area the price difference was about $0.53 per gallon. DP, I don't doubt your numbers.
The main point I'm trying to make is people keep throwing around numbers to prove a point, they throw out opinions, but the truth is they don't have a clue what they are talking about. They haven't kept exact records and run the numbers.
DP you said you kept track of every dime you have put in your vehicles. You have hundreds of thousands of miles on these vehicles. Let's ignore the initial cost and the resale value. Just maintance and fuel cost. What is the cost per mile of these. My guess is you can't or won't crunch the numbers, it's a lot of work. I admit I don't have the numbers.
There is a guy on the Cummins forum that has close to 1,000,000 miles on his truck. He is a hot shotter. He has kept track of every expense on his truck, every drop of fuel. He got over 900,000 miles out of his original engine without a rebuild. He averaged well over 200,000 miles on injectors. This guy knows exactly how much his truck has cost per mile.