so 1/4 a gallon every 15 minutes is 1 gallon per hour. So if my car gets around 40mpg highway, i could drive on the highway at 40mph for an hour and burn the EXACT SAME amount of gas as if i was not moving. Give me a break
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I agree a gallon per hour might be high, but ...
engines do burn more gas while cold, and
If it costs you $1 or less to do this, and you will only be doing it a few times (less than 30 times a year, I'd expect),
it's not a budget buster.
-- Ed
(HM, my neighborhood teenage felon Seth moved away, so I no longer have to worry about HIM stealing my car, or breaking into my house. He was an interesting next door neighbor for a long time.)