Quick question. In the summer time I would get 30-32mpg( 210 miles every half tank) with my 05 Corolla-Auto. Now in the winter time I only get 24-25mpg tops ( 150-160 every half tank). I've had this car for 2 years now and its always the same, Goes up in the summer but way down in the winter. Is this typical or do you have any ideas or suggestions ? This is all city driving.
That 24-25mpg is my best winter so far. It sometimes gets as low as 22mpg. I just don't see why it would be that great of a difference. It can be a 10mpg difference Summer to Winter.
I'm experiencing the same thing with all the cold weather we've been having lately.
I didn't think that the Corolla was so sensitive to these changes. I remember my 1988 Mustang GT 5.0L Auto was better at maintaining a steady mileage. That car " considering the year and type" got 19mpg all the time doing the same city driving and only fell to 17.5 to 18 mpg's in the winter. So I figured with Toyota's reputation that a car built by them would be much more consistent from season to season.
I didn't think that the Corolla was so sensitive to these changes. I remember my 1988 Mustang GT 5.0L Auto was better at maintaining a steady mileage. That car " considering the year and type" got 19mpg all the time doing the same city driving and only fell to 17.5 to 18 mpg's in the winter. So I figured with Toyota's reputation that a car built by them would be much more consistent from season to season.
I think there is a lot more ethanol around in the last couple years.
Around here, I get much better economy in the "winter" due to not running the A/C much. In the spring/summer/fall, the A/C is on pretty often. For 4-5 months, it's on 24/7. My fuel economy jumps about 10% in the winter due to no A/C use. And as far as I know, our gas is the same hear all year around...E10 that is. I get about 35 MPG on my commute now. I was getting low-to-mid 30s in the summer. I've never had a tank at less than 30 MPG with this car.
My fuel economy jumps about 10% in the winter due to no A/C use.
Every time you use your defrosters in the winter your AC kicks on and some people not realizing it leave their defrosts on instead of changing the flow direction, I know I've done it quite a few times myself!
As far as testing is concerned, tech your Gas Mileage will go down in the summertime as it takes more fuel to run the vech then in winter, its pretty simple actually, the outside air is hotter, the engine is hotter, thus you are actually looseing fuel when it enteres the engine due to evaporation, where as in winter almost 100% of the fuel is actually burned, id do what another poster suggested and check the defrost and state reg's, i know in CA when summer comes around the change the make up of our fuel like crazy, its supposed to clean burner or something but all i know is it takes a LOT more to get the car actually moveing forward.
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