Anyone else notice that thier gas mileage drops off when the weather turns cool, or am I just enjoying that extra boost of power too much from the cold weather?

 

Isn't it typical. Once you put in CAI, you get worse milage, so its the same reason with cold weather? Just wondering?

 

Logically one would think it does make a slight difference in colder weather by using more accesories etc.

In my 95 I never noticed anything different.

I haven't had my '03 long enough to say.

 

cold air is thicker thus pulling more fuel into the engine, thus using more gas decreasing mileage...

 

i have noticed this. my gas used to average 23mpg now its down to 21mpg.

 

The car drives even better when its cold, but i have noticed this too. Might also have something to do with the fact that the gas stations use gas with 10% ethanol during the winter. Or something to that degree.

 

I also warm the car up longer when its cold/leave it running when I go into stores...... it all adds up!

 

extra additives in gasoline in colder regions help add to decreased mileage as well.

 

it is basically a combination of all of the things you're citing. Dense/cold air makes the MAF send a signal to the engine to add more fuel(over a typical summer temp) and thus will richen the mixture(that extra oxygen and fuel is where your power is coming from). As well most people do let their car idle for longer during startup, along errands, etc. And the addition of the a/c spinning for the defroster, the added time the car is in open loop(dumping fuel and not reckecking via O2 sensors) All of these things add up. however certain resistances change. Aerodynamic drag will increase slightly, while rolling resistance will lower slightly given the same tire pressures. I personally experience a slight loss of fuel economy in cold months, i've noted it mostly due to the added idling.

 

I don't know about youse guyz, but after the SEAFOAM treatment and the usual CAI, Y-pipe, ECU reprogram, etc. mods I just averaged just at 30 mpg doing about 68-80 mph the whole trip for about 250 miles. Around town I get about 23 mpg. Is that about what you all get?

 

Its the additives in the fuel they use in the winter mix.