How much fuel can the AUTOTHERM ERS system save me?

I always thought diesel engines sipped fuel and needed to be idled because they’re so hard to start in the cold?

Small truck diesel can easily consume ¾ of a gallon of fuel in an hour at low idle.
A large class 8 truck engine can burn 1 to 1.2 gallons or more at high idle.

According to the U. S. Dept. of energy, idling each winter costs the long-distance trucking industry a per-truck average approaching $5000 per winter for fuel, maintenance and decreased vehicle service life. Multiply this by 400,000 to 500,000 L. D. trucks and the money wasted in idling each winter becomes substantial.

A well-maintained diesel engine with winter fuel or fuel additive is not difficult to start.

And a warmed diesel is not difficult to restart.

The AUTOTHERM ERS systems never cool engine coolant down to ambient (outside) temperatures. Operation terminates when coolant temperature drops to around 95° F. T
he rest of the engine coolant cool-down takes place at the same rate as any shut-off engine. In extremely cold weather, ether starters help cold engine starting.