We shut off gas engines any time we will be sitting idle for a short (but pretty well know) period. For example, at a drive in bank teller. We never shut off any engine at traffic lights where having the engine running can be a safety benefit. BUT...

Every time we shut off our 35d engine there is a lot of commotion under the hood that lasts quite awhile -- certainly more than 4 seconds. Until I know for sure what is going on, we have quit shutting off the 35d unless we will be stopped for quite awhile (AKA getting out of it). Besides, the biggest outstanding issue with E70s is the low battery that can leave an E70 disabled. We want to reduce battery load and maximize charging as much as possible.

Funf Dreisig

p.s. I can see the X5's "unfavorable driver" report for owners who drive short trips. "Not only does my owner not spend enough quality time with me, he's a big turn off too!"