How much Wheelbase affect MPG ? (New truck purchase)

It depends what you are going to use it for. Pulling a van people usually recommend no more than a couple of feet between the fairing and the trailer before you start to see significant(?) losses in fuel mileage. Pulling a flat or a tank it usually doesnt matter near as much. If your loads are always light you could run the fifth wheel up as far as possible without overloading the steer axle. I'd go with the longer wheelbase for versatility down the road myself.

 

You found a good truck and I would go with it because of the spec's. If you own the van you can add an aerodymanic thing that goes on the front of the van. The longer wheelbase not only makes it more flexible but for a more comfortable ride.

KH

 

Yes, that will help.

These will help also - http://www.airtab.com/main.html

 

Cummins White Paper: Secrets of Better Fuel Economy - The Physics of MPG

 

Help what, make your wallet lighter? Better add a 3000d to those airtabs!

 

You should research things before sticking your foot in your mouth.

It is a well known fact that air turbulence causes a significant reduction in fuel mileage. You can see for yourself in wind tunnel testing that the airtabs greatly reduce the turbulence between truck and trailer.

By using clear tubing you can also see how the FASS system removes air from the fuel.

You only have the manufacturers claim and user testimonials that the 3000d works.

 

i have a 300d on my truck...never saw any increase in mpg. should have keep the money.

 

I know a guy that put air tabs on his trailer. He hauls light most of the time mostly just cardboard. He only had them a couple of weeks when I talked to him last. He said that he was not sure about the mpg improvments cause he had not been doing his normal run all the time. But that it did seem to be up about 2 tenths. He also said the most noticable differance was how the trailer handled when it was light. Told me he thought they were worth it.
If I catch up to him again I see if he has a better idea of any mpg differance.