[ecomodded]

The kill switch is more effective at saving gas then engine on braking on the steep hills, as follows.
It will be best to use neutral when ever the full power brakes and steering is not needed. The steep grade hills will be approached engine off and coasted for the first few 100 meters until the speed increases then put in gear, at the bottom of the hill it will be put back in neutral,still engine off and coasted until i need to restart the car.
Simply put there is nothing more fuel efficient then a non running motor.

The idle consumption is more then i anticipated, .8 or .9 of a gallon a hour is large. I should be seeing a hefty mpg gain. With a modest 10% mpg improvement it would mean 6 mpg with my car.