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Idling in N vs D observations
Before I got my scangauge I had done a little testing with my generic ODB reader and had noticed that the % load indicator did show a significant difference between idling in gear vs D in my automatic. So while I don't shut off my engine at lights, I do shift into N if I know it will be a long light.
I have retested this with the scangauge by timing the amount of time it takes for my overall tank average to drop a tenth of a MPG while sitting still in N vs D.
The difference is about 30%. Which is to say that sitting at a light in N costs you 70% of sitting there in D.
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