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I used the stopwatch method and seeing some wait-times of over a minute and the jumps of idle GPH from 0.24 D to 0.17 N, the gains can be calculated and I was sold on engine-off at lights. As for starter wear I try to minimize the shutdowns to 5 or 6 a day or 2 times at the lights (which works out for me since my route sees only a few long waits)
Cold engine stuck on a long light = worst case scenario for MPG loss. Block heater is definitely on my "future to do" list.
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My 5 pillars of fuel efficiency:- driving style
- aerodynamics
- tires
- weight reduction
- engine maintenance
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