Mmmmmmmm, did anybody mention CRAP!!!!!

 

maybe down hill out of gear?

 

The only way possible is to have propane running on a drip system (more common overseas) instead of spraying it. NO WAY IMO.

 

I can't even get close to that with my 4cyl Saturn down hill...

 

Well I know its crap but what I see is.

Let's start with a base of 16-18 as a usually expected mpg out of these trucks right.

I think the best you could ever get from the following mods are as follows:
mileage box 1.5 - 2
topper or bed cover .5
dynatrac free spin 1-1.5
small tires .5 or less
exhaust and air .25 or less
fuel system with filters 1
gear vendors or us gear overdrive 1.5-2
synthetic fluids .25 or less
fuel addatives .25 or less
different injectors 1

I'm sure there are others I forgot but those are the bests I have heard from. People on this and other sites and it don't add up to no stinkin 35-40

 

That is altogether possible!

I have an 07 Toyoto Camry (yea, it's a Hybrid!).

One day after filling up I gently left the gas station and coasted down hill to the stop sign (about a 100 yards) and the tank average read 99.9 MPG! Maybe that is what this guy is doing?

BTW.....my Camry got 43.8 MPG (driving 75 and 80) on my last trip from San Diego to Las Vegas ...to put that in perspective, I can leave my home in Vegas, drive to the beach in San Diego and back on one tank! And the tank is small!
The Camry gets better gas mileage than my Honda Goldwing motorcycle!

...Now if it only had a Cummins in it.......