Looking around online, most of this discussion is about idling diesels. They seem to mostly agree on one gallon per hour. In the gasoline-powered world, there isn't as much out there, but what there is seems to agree on 0.5 to 1.5 gallons per hour.
If Zigzag03 started idling with a full tank, a fill-up and some math would be the perfect opportunity to learn what that V-10's consumption was.
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