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You forgot one very important concept in maximizing fuel efficiency...something that Toyota absolutely banked on: idle time.
Any idling at stoplights, and even stop signs (for those couple seconds) wastes gas. So what do you do? You turn the engine off. That's where the Prius gets the high gas mileage. Anytime the engine is not needed for motive power, the car shuts it off automatically. It's a pretty simple concept really...it's just automated. I just wish GM or Ford came up with it first, but that's another story.
Of course, this isn't exactly practical with a Suby. It puts unnecessary wear on the starter and battery. But I have done it with my truck for those long turning lane lights when gas was at its peak. Verified by my ScanGauge (in truck), it did help because any high MPG I aquired by moving would quickly be reduced by idling, even for a couple of seconds. This applies especially on short trips where the average has more highs and lows rather than constants.
So however you want to do it, consider idle time.
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