Quote:
Originally Posted by Isaac Zachary
Although if you're idling down a hill you're still burining fuel. Shutting off the engine would burn zero fuel, but then you can't blip the throttle to get the gears to mesh.
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Right, but it isnīt a lot. My car (BMW 523i E39) consumes a litre per hour while idling with a warmed up engine. I have a analog fuel consumption gauge, and I learned: If it is on about "4 l/100 km" while driving with 100 km/h, I can easily put out the gear without a loss of speed. Result: 1l/100 km. With a switched off engine it would be 0l/100 km, but with no steering support (old car with a hydraulic pump) and, after a few braking processes, with no brake booster. Thatīs why I never switching the engine off, although itīs not illegal here in germany.