Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - A/C? (instantaneous mpg drops between 4 and 6 mpg with AC on)

roosterk0031 · 08-10-2012, 10:14 AM

With the Cobalt, I've only recorded one trip with AC on, it was 42(why record bad trips) vs same trip without AC averages about 48, trip average speed is about 50 mph. Comes to about 12% loss.

At idle gph goes from 0.3 to 0.4 no air vs air. So just for comparison. Changing the average speed to 48 mph to make the math easier, without air I use a gallon per hour. If with air I use 1.1 gallons to go the same 48 miles I get 43.6 mpg. (9% loss)

AC setting pretty much same as Old Mech, I'm usually ok until temps in 90's, and I get to park in the drive thru at work so car isn't really hot when I leave.

08-10-2012, 10:14 AM	#4 (permalink)
roosterk0031 Master EcoModder Join Date: Jan 2011 Location: na Posts: 1,025 Thanks: 277 Thanked 218 Times in 185 Posts	With the Cobalt, I've only recorded one trip with AC on, it was 42(why record bad trips) vs same trip without AC averages about 48, trip average speed is about 50 mph. Comes to about 12% loss. At idle gph goes from 0.3 to 0.4 no air vs air. So just for comparison. Changing the average speed to 48 mph to make the math easier, without air I use a gallon per hour. If with air I use 1.1 gallons to go the same 48 miles I get 43.6 mpg. (9% loss) AC setting pretty much same as Old Mech, I'm usually ok until temps in 90's, and I get to park in the drive thru at work so car isn't really hot when I leave.