temperature and mpg

[subieguy83]

does how hot it is affect mpg? it's like. 100 degrees where I'm at and my mpg sux only like 30mpg. ima check tires to see if it's low on air but I doubt it

[subieguy83]

oh yea all stop light to stop light no freeway

[OneFitZ]

Air isn't as dense when it's that hot as compared to when it's, say, 80 degrees out. The engine is working harder to do the same amount of work so yes the mpg "sux" when it's hot outside.

[Klasse Act]

I've been getting over 40 mpg's in the heat here in Chicagoland, it was over 100 3 days in a row last week or so and upper to mid 90's and my mpg's were still over 40 mpg. My route is 25% city and 75% highway and with the a/c on and in SPORT mode, the auto start/stop feature rarely works, just the way the car is set up.

[nem]

It has consistently been over 100 where I'm at. I try to use no AC in morning/night. AC all the time during the day. I'm getting right around 40 with about 35% street 65% highway. I would just say watch your instantaneous mpg bar and try to drive where it is as close to 50 as possible. This means watching for upcoming red lights or "stale" green lights and not punching it hard all the time. Also be mindful of hills, try to glide a lot.


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[subieguy83]

oh wow yea I drive in traffic a lot and I have a 6 speef

[sirjonsnow]

Originally Posted by OneFitZ

Air isn't as dense when it's that hot as compared to when it's, say, 80 degrees out. The engine is working harder to do the same amount of work so yes the mpg "sux" when it's hot outside.

Um, no. It burns a leaner mix, cold air causes you to use more fuel for the same throttle opening because you use more fuel to match with the denser air. It's blasting his AC that's dropping his MPGs.

[Varmint]

It will depend somewhat on the speeds you drive. The air is less dense (meaning less power), but that also means less resistance at highway speeds. If you're driving at city speeds, you don't get much benefit from the change in density.

I got this from a PFMB science show.

[TytaniumK]

Originally Posted by Varmint

I got this from a PFMB science show.

Pretty F-ing Mind Blowing

[Jwarian]

It's the a/c as well as your assist being cut due to overheating

Watch, after a few minutes the assist will drop to two bars after about 2k even on full throttle. It's to protect the battery, I just keep her below 2k and my mileage stays above 40