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wheelspin1, the mileage depends totally on how you drive. The engine is very economical (after it is fully warmed up), the transmission will grab 5th at under 65 KPH and hold it down to 50 KPH.
I've done some steady state cruising tests on flat surfaces with a fairly well calibrated ScanGauge on a 3.3L AWD, no roof rails and the tires at max sidewall and generally observed the following:
approx 7.3 litres per 100 KMs from 60 to 80 KPH (32 MPG from 38 to 50) 7.6 @ 84 KPH (31 @ 52 MPH) 7.8 @ 88 KPH (30 @ 55) 8.4 @ 96 KPH (28 @ 60) 9.4 @ 105 KPH (25 @ 65) 11.2 @ 113 KPH (21 @ 70)
While that sounds good, every hill, acceleration, headwind, corner, bump or use of any gear but 5th will really eat into it, especially in the city and especially in the cold. I doubt the other vehicles would be much different. These are 2 tonne barn doors.
With short trips in the winter, a block heater helps a lot, but from a pure payback basis, it'll only save about 15 cents worth of gasoline in the morning (with a 2½ hour preheat) for about 10 cents worth of electricity - so at a nickel a day, 200 days a year... it'll never pay for itself (although they could be added at the factory for $10, and they'd save that each year for us Canucks).
I think Don's numbers overall are very realistic. Aggressive drivers are going to do somewhat worse, slowpoke coasters like me will do somewhat better.
The AC compressor adds only 0.3 LPH to the equation... not bad at all.
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