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My xB consumes about .33 gph at cold idle without mods. That drops to less than half (.14 gph) when it's warmed up, and 1/3 (.11 gph) when it's fully warmed up.
You're far better off, IMHO, to use your engine to propel the car while it's warming up. If the engine's running, it should be doing useful work. By the time my engine coolant reaches 134 degrees F, I'm four miles down the road, and I'm up to a 50 mpg avg for that distance. You sure aren't going to match that with your car parked in the driveway warming up.
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Darrell
Boycotting Exxon since 1989, BP since 2010
Have you ever noticed that anybody driving slower than you is an idiot, and anyone going faster than you is a maniac? George Carlin
Mean Green Toaster Machine
49.5 mpg avg over 53,000 miles. 176% of '08 EPA
Best flat drive 94.5 mpg for 10.1 mi
Longest tank 1033 km (642 mi) on 10.56 gal = 60.8 mpg
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