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PaleMelanesian · 03-23-2010, 02:20 PM

I have measured a slowdown in the warmup time by having the temperature set on hot, even with the blower off. You want the engine to warm up as fast as possible, because a cold engine guzzles much more fuel. see below

Once the car is warm, I don't think it makes a difference, other than the power draw for the fan.

Mini-experiment: cold start fuel consumption and warm-up time - MetroMPG.com

03-23-2010, 02:20 PM	#3 (permalink)
PaleMelanesian Hypermiler Join Date: Dec 2007 Location: Texas Posts: 2,321 PaleCivic (retired) - '96 Honda Civic DX Sedan 90 day: 69.2 mpg (US) PaleFit - '09 Honda Fit Sport Team Honda Wagons 90 day: 44.06 mpg (US) Thanks: 611 Thanked 433 Times in 283 Posts	I have measured a slowdown in the warmup time by having the temperature set on hot, even with the blower off. You want the engine to warm up as fast as possible, because a cold engine guzzles much more fuel. see below Once the car is warm, I don't think it makes a difference, other than the power draw for the fan. Mini-experiment: cold start fuel consumption and warm-up time - MetroMPG.com __________________ 11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles