Cold weather = bad gas mileage?

**JET** · 12-10-2007

Yes, that happens with any car. Usually drops a good 10%.

Andrew7dg · 12-10-2007

I noticed the change also

Think about what the computer reads and adjusts for.

Coolent temperature sensor.
When they go bad, car doesn't want to start. Why?

Thats because the computer adjust the fuel ratio when it is cold so it will start and stay running.

It could be that you are buring a lot of fuel before the engine is warmed up and that is giving you high gas consumption

I am guessing cold intake temps play a factor in this also.

Kevin 1G Drummer · 12-10-2007

Quote:

Originally Posted by JET

Yes, that happens with any car. Usually drops a good 10%.

I'm guessing it's something with the density of the air? I've also noticed that just cruising, I'm at a lower level of vaccuum (closer to 0 on the boost gauge) I suppose that could also have an affect due to the higher fuel pressure?

Matt D. · 12-10-2007

Quote:

Originally Posted by Kevin_1G_Drummer

I'm guessing it's something with the density of the air?

Correct. Cold air is more dense which requires more fuel to see the same air/fuel ratio as when the air is warm. I struggle to get 20mpg in town during the winter with the Evo where as I normally get 22-24.