Will this rig get me thru the western mountains

AllegroD wrote:
I got 12 MPG once,going down hill. I could have gotten better but did not want to turn off the engine.

With modern gas engines with electronic fuel injection, you don't save gas by shutting the engine off when engine braking. They are programmed to cut off the gas supply when the throttle is closed and the engine speed is above idle. It's an easy way for them to gain a bit better mileage (which sells) with no downside, so it's as close to a univrrsal feature as you'll find.