noteven wrote:
For the best fuel economy per ton/mile you need a high compression long stroke turbo supercharged engine that has in cylinder multi-injection of a high power density fuel... like big trucks use...
Adding more overdrive trans ratios in front of salt flats axle ratios doesn’t do much for tow performance but works great for no load driving.
My coach is about 15,000 lbs. With the original carbed 440 it got 7+- mpg. Changed the 440 to an Edelbrock Multi-point fuel injection system and mpg went up to 7.5 mpg. Those were the numbers for about 60,000 miles.
Changed my engine to one as described in the first paragraph above (a 2006 Duramax 6.6L turbo diesel) and my mileage has been a cumulative 13.4 mpg over 53,400 miles. Same coach, same weight, similar speeds, same driver. It’s the difference that comes from doing what is described above.
