I'll add the figures for my 4.7L V8 Ram. Once warmed up, it idles at 490-510rpm and 0.45-0.50 gal/hr. My wife's 2.4L I-4 Avenger will idle at about 700rpm, at 0.34 gal/hr.
Ram has an MPGuino; Avenger has an OBDuino.
if 1 US Gal/hr = 3.78541178 liters / hour then my truck drinks 1.7-1.893 l/hr at idle. Wow. But, for a V8 it still seems pretty good.
@Frank Lee, I hear you on people idling vehicles in driveways. It's ridiculous. People here in OKC do it when it's 50*F outside. Really? Saw the same thing when I was in San Antonio.
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