Does Gas Milage go down in hot weather?

[Texmaster]

Just curious because I've seen a .2 drop since it started getting hot. My tires are fine and I've had an oil change.

 

[rootaxs]

Well, hot or cold there's always a cause for lower mpg.

If it's cold season the stations put additives in the gas to compensate for the temperature and thus lower mileage
During the hot season there's no additive but the forces of nature is there - Evaporation. However, the rate of such shouldn't be that high. 0.2mpg isn't that drastic of a number IMHO. I'm surprised you could even tell 🙂

 

[GrumpyMan]

If you are using your A/C my guess is that it would increase more than that. A/C on or off are you asking?

 

[Texmaster]

<< Well, hot or cold there's always a cause for lower mpg.

If it's cold season the stations put additives in the gas to compensate for the temperature and thus lower mileage
During the hot season there's no additive but the forces of nature is there - Evaporation. However, the rate of such shouldn't be that high. 0.2mpg isn't that drastic of a number IMHO. I'm surprised you could even tell 🙂 >>



Well I have one of those digital gas readers. Makes it easy 😀

thanks for the info guys.

 

[308nato]

Stop putting the pedal to the metal stalking every blonde in a convertible with the top down and you might see the mpg actually improve there Tex.😀

 

[Texmaster]

<< Stop putting the pedal to the metal stalking every blonde in a convertible with the top down and you might see the mpg actually improve there Tex.😀 >>



Aw come on. Thats just a bonus to driving 😀

 

[thebestMAX]

Ive always heard that cool temeratures with high humidity give the best mileage, 40F just after a rainstorm being the best conditions.

What are you driving?

 

[LAUST]

<< Well, hot or cold there's always a cause for lower mpg.

If it's cold season the stations put additives in the gas to compensate for the temperature and thus lower mileage
During the hot season there's no additive but the forces of nature is there - Evaporation. However, the rate of such shouldn't be that high. 0.2mpg isn't that drastic of a number IMHO. I'm surprised you could even tell 🙂 >>


That would be correct... the last big bad additive was MTBE, I think they have actually gotten rid of it and replaced that one though, but yep, there is always something in there to make it worse.

My winter milage is always worse

 

[Pacfanweb]

Remember they change the formulation of gas from winter to summer, that can affect mileage, depending on where you live.

 

[rootaxs]

In that case, you're probably still within your average MPG #'s. The one in my car is *always* off by a couple of MPG's. (I double check using the old method of calculating mileage). 🙂

Last winter my "computer" #'s were in the 18mpg range, actual is 21 (avg). Now it's up to 21 (computer) and 24 (actual).



<<
Well I have one of those digital gas readers. Makes it easy 😀
thanks for the info guys. >>

 

[yakko]

<< Ive always heard that cool temeratures with high humidity give the best mileage, 40F just after a rainstorm being the best conditions. >>

You are correct.

 

[Peetoeng]

Basically, yes. Hotter air means less air and thus power from your engine for each power stroke. And for older car with pinging problem, hot weather would make gas mileage much worse. If you have a pinging problem, try get a higher octane gas.

Humidity also decreases gas mileage, because some oxygen get displaced by water vapor.

 

[crab]

Not sure about cars but during the summer, in high humidity, the planes perform drastically worse. They accelerate like ass, climb like ass, cruise like ass... Especially in high elevations. I always flew at about 8-9AM.