Diesel fuel has 20% more BTU
Diesel fuel has 20% more BTU's than gasoline. No matter how efficient gasoline engines get, Diesels will always get better fuel mileage. Diesel fuel costs about the same as super grade of gasoline-not a dollar more. New Diesels with Bluetec (urea) are getting the best fuel mileage ever. I sell Freightliner trucks and we're seeing 80,000lb trucks getting 8mpg. Try getting that on gasoline, propane or the infamous natural gas. Why would anyone buy gasoline when you can get a Diesel that is at the minimum 20% more fuel efficient with fuel that is basically equal to high test gasoline? As fuel mileage requirements get more severe, we will see more Diesels, and what makes sense to me-Diesel hybrids.