[brucepick]

Tesla wrote:
"Isn't that a form of regenerative braking?
Does it have to be converted to electricity, compressed air, spinning flywheel, hydrogen to be defined as regenerative?"

I'd think you would have to capture the energy somewhere to say its regenerative.

My grill block is adjustable but I need to get out of the car to change it. With a 55 mile highway commute, I try to avoid stopping. I monitor engine temp via ScanGauge.

For me, the game is to block as much air as possible (to reduce both aero drag AND heat loss from engine), WITHOUT letting engine temp go out of range. That happens if there is too much grill block for the conditions.

Aside from avoiding overheating, the last thing I want is to cool the engine below the approx 190 deg F it normally runs at. And I indefinitely don't want increased grill block when putting more load on the engine. If anything, it might need reduced block at such times.