You mentioned not wanting to shut off your engine for "only a minute or so". (!!!!) Some of us will shut it off for 10 to 20 SECONDS! I highly suggest you consider shutting off your engine if you're reasonably sure you'll be stopped for at least 30 seconds. Idling while not moving =
zero MPG. That
really skews your average DOWN!!!!!
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The problem with this for me is I make an average of 60 deliverys a day each ranging in time from 90seconds to 10 minutes. I will usually shut down the engine if I know its going to be more then 2-3 minutes. Starters arent cheap and arent easy to replace on my truck.