Quote:
Originally Posted by TimV
The way i drive is as following: when i see a traffic jam or slow trafic or a red light. I put the car in nutral and let it coast with an ideling engine.
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Since diesel engines are fuel delivery throttled, as soon as you lift off, the engine uses zero fuel during overrun. Unless you need the extra coast distance, slowing in gear saves fuel and brake wear (and dirty wheels
).
As for P&G etc, you'll have to try on your own to find out. Different cars will respond to different techniques.