Subject	Lots of variables
Posted by	Red Hawk (CO) on January 04, 2013 at 9:59 AM
	This message has been viewed 153 times.
In Reply To	lower mpg during winter? >> posted by stockplayerz(nyc) on January 04, 2013 at 09:28 AM
Message	I hear this story from a lot of people. There are many things that can cause this. Did you put Winter Tires on? they usually have a higher coefficient on friction ( this includes rolling friction) The change in air density. This will cause your tires to be up to ten lbs lower than their pressure in the summer ( more fricion again) Higher overall friction in the air from a denser relative atmosphere ( I think this theory is relatively negatable ) Denser Intake Charge. More air through the MAF meaning your car dumps more fuel to keep AFRs correct. Many people claim their cars are faster in colder temps. Also, many people claim that some gas stations even slightly change their gas blends in the winter with something that makes less efficient. ( dont ask me how or why, seems alittle bogus to me ) But like I said, many variables... and I'm sure I just named a few. TT BEAST IN PROGRESS!
Follow Ups	lower mpg during winter? >> - stockplayerz(nyc) 09:28:22 01/04/13 my DD (Mazda Protege) gets about 10-20% less in the winter (n/m) - Shiers69 09:57:47 01/04/13 haha protege is my dd too - WhiTTe Z 10:18:53 01/04/13 third. My Protege is my DD. Fast approaching 196k miles. - MixManMash 15:51:42 01/04/13 155k here. - WhiTTe Z 07:15:33 01/05/13 rest is negligible, hit up tires and regain normal mpg (n/m) - LJZTT 11:13:22 01/05/13 Air density can play a big role. My civic drops from - black300zx 18:37:08 01/05/13 Can't argue with physics charts :) (n/m) - vorpalZ 09:00:09 01/06/13 especially one as comprehensive and clear as that (n/m) - LJZTT 10:45:20 01/06/13 Wow - that came out smaller than I expected - sorry - black300zx 14:00:54 01/06/13 just giving you a hard time - LJZTT 11:12:12 01/07/13 I thought you were being serious anyway, not sarcastic - black300zx 19:51:21 01/07/13 BTW - that chart contains 219 fuel-ups and >83k miles (n/m) - black300zx 14:01:59 01/06/13 Dang. I fuel up my dd once a month. :) (n/m) - SactoTodd 14:22:06 01/06/13 Lots of variables - Red Hawk (CO) 09:59:43 01/04/13 How are yall calculating mpgs? (n/m) - Krazyd27(Houston) 10:30:52 01/04/13 Reset your trip odo with every fill up, always fill up (n/m) - BigTDogg (MA) 10:40:27 01/04/13 Thanks BigT (n/m) - Krazyd27(Houston) 10:42:16 01/04/13 I have found the tire pressure drop in winter to cause a 10% - LJZTT 13:35:48 01/04/13 Ethanol, More oxygen are two things you can't control (n/m) - BigTDogg (MA) 10:13:37 01/04/13 Yes, dropped from 22 to 18 here in MN (n/m) - Summeronthechain (MN) 10:19:46 01/04/13 Try letting the car warm up first - lazer(NJ) 10:40:26 01/04/13 I don't think you are correct here. The gas wasted while - zellamay 13:27:16 01/04/13 Mileage experts agree. Don't warm up... just start driving. (n/m) - Gordo 93TT Daytona 16:43:07 01/04/13 more idling, change in winter fuel composition, and all of - vorpalZ 11:02:43 01/04/13 Haven't heard that in a while... - Z DNA 12:15:31 01/04/13 In most of the U.S., the winter fuel blend results in - cherry 12:29:20 01/04/13 Not here around Virginia Beach... - Z DNA 05:09:52 01/05/13 Here in AZ, we have a different blend in winter, or - zellamay 13:28:59 01/04/13 Winter fuel "specs" are different. - Inzane 14:29:04 01/04/13 What are these mpgs you speak of? (n/m) - Lumpydonut 12:38:50 01/04/13 Take your foot off the gas pedal once in a while, you'll - zellamay 13:30:54 01/04/13 Probably not a bad idea, but I didn't buy and modify - Lumpydonut 08:55:14 01/05/13 2nd. Did he mean mpegs? If so, then mine definitely drop - ConVerTT 11:13:19 01/05/13 your tire pressure probably dropped several psi - LJZTT 13:31:06 01/04/13 This is the answer. (n/m) - Dustin 20:03:12 01/04/13 It's normal that if cooler weather causes an increase in pwr - craigz96tt (SC) 15:45:31 01/04/13 My mpg goes up 1-2 in winter because I use A/C alot less (n/m) - Zvil (FL) 08:02:18 01/05/13
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