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stimpsonjcat · 08-31-2011, 10:04 AM

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.

08-31-2011, 10:04 AM	#1 (permalink)
stimpsonjcat n00b Join Date: Aug 2011 Location: Dawsonville Posts: 39 stimpsF150 - '01 Ford F-150 Supercrew 90 day: 16.5 mpg (US) shifty - '12 Mazda 3 i-touring 90 day: 38.02 mpg (US) Thanks: 0 Thanked 4 Times in 3 Posts	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. __________________