Quote Originally Posted by Anonymous View Post
Not to mention extra wear and tear on the starter.
I was just about to say this. On top of this, engine start up causes up to 90% of engine wear.
Yes its already warm, but your letting all the oil settle then a "less" lubericated engine is started.
Regardless of engine temp, the ecu will raise rpm and enrich fueling until it checks all sensors. This takes a few seconds to minutes,
Hell, my catalytic temp doesnt operate until its at least 165 F, I assume the o2 sensor( which controls fuelling ) also isnt fully operating once the engine is turned off, until it cycles up to temp again.

Short trips and start/stop will increase fuel unless the ecu is designed to operate in those conditions and thus have the appropriate programming to understand this is a red light stop/start, car only understands "im on, and now im off, im on" just like a laptop , desktop or cell phone, the default start up protocol is to cycle first, then determine what to do. Until it figures this out it assumes it must use the enrichment startup table.

Hope that all makes sense.