Gas Mileage with my 2009 Yaris Sedan - Toyota Yaris Forums

Yaris Hilton · 06-03-2009, 06:51 AM

I got a striking demonstration of how much the air conditioning sucks mileage down yesterday. It was a 90° afternoon, and I had the AC turned on full blast when I left the office, something I've seldom done. There's a little stretch of 55 MPH highway before I come into town, and the speed limit drops to 45 near the bottom of a hill just before starting up again. I normally come off the gas before the advance signs that the speed limit's about to drop, and it goes into DFCO, but the hill keeps it coasting near 55 until it starts back up the slope, and the car goes way up the slope before getting down to 45. With the AC compressor maxed out, it slowed to 45 by the bottom of the hill before starting back up. Huge difference! I've heard people complain about the Yaris' AC being marginal, and it is when the car's been baking in direct sunshine in hot weather. But it draws a lot of power off and you really notice that a lot more in a little car with a ~100 HP engine than you do in a big sedan with an American V8 or turbo. I've said before that I'd be happy with the 1000cc engine, but I think it wouldn't be able to run the AC and maintain decent normal driving performance.

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06-03-2009, 06:51 AM	#34
Yaris Hilton Half a Bubble Off Plumb Drives: 2009 Yaris Sedan Join Date: Mar 2009 Location: Bristol, Tennessee, USA Posts: 1,593	I got a striking demonstration of how much the air conditioning sucks mileage down yesterday. It was a 90° afternoon, and I had the AC turned on full blast when I left the office, something I've seldom done. There's a little stretch of 55 MPH highway before I come into town, and the speed limit drops to 45 near the bottom of a hill just before starting up again. I normally come off the gas before the advance signs that the speed limit's about to drop, and it goes into DFCO, but the hill keeps it coasting near 55 until it starts back up the slope, and the car goes way up the slope before getting down to 45. With the AC compressor maxed out, it slowed to 45 by the bottom of the hill before starting back up. Huge difference! I've heard people complain about the Yaris' AC being marginal, and it is when the car's been baking in direct sunshine in hot weather. But it draws a lot of power off and you really notice that a lot more in a little car with a ~100 HP engine than you do in a big sedan with an American V8 or turbo. I've said before that I'd be happy with the 1000cc engine, but I think it wouldn't be able to run the AC and maintain decent normal driving performance.