What's everyone think? I call B.S

[Grizzly]

12 valves get really good mileage

ASchwartz and mopsrtech:



That's not always true. My 05 3500 DRW 12v, with 3. 73 gears gets better, all around mileage, then my 95 DRW 24v, with 4. 10 gears did.

 

[KennethS]

My 95 Dodge Motot Home with car trailer gets14 best

My 95 12 valve one ton Motor Home with the encxlose trailer and a 39 Ford in the trailer 11 to 14 running 60 to 65. The best I ever got was 17. 4 driving 50 on the Natches highwas. I never have got 20 out of either of my diesel trucks a 2006 ands my 95