Yet another MPG thread

I was wondering if my MPG drop that I have seen over the past couple weeks is due to the fact that the weather is colder out in chicago.

I can not attribute it to anything else. I recently replaced the fuel filter and cleaned my kn oil filter.

However I have seen my MPG drop from around 18 mpg average to about 15-16 avg.

I am wondering if perhaps if I overoiled the KN filter, it may cause it to lower my MPG?

 

Mine has dropped too. The weather has become a little colder here. I thought it was because of the low tire pressure. But it could also be from the winter gas mix.

 

Yeah I figured that the winter gas would have a bit of an affect, however it just seems to me that after i oiled the KN Filter, my MPG went down.

Also one thing has been nagging me for the last 8k miles. At 45k miles I switched from the stock spark plugs to NGK Iridiums which are single prong.

I realized that the truck requires dual prong, however I was told that the singles would work.

Now in others experience, do the single iridiums give less mpg than the dual prongs?

 

Probably the colder weather. the computer could be adjusting to a richer Fuel/air mixture.
I am switching to Ethanol free gas at my next fill up. Two stations sell it around here. Ethanol is garbage. I tried running 91 octane with no MPG improvement.

 

Yeah I figured that it probably had something to do with the winter gas, I just thought it seemed so soon for the winter gas. lol

I guess winter is almost here.

 

Yeah it seems the winter gas is here. I have noticed a difference as well.

 

They put other 'stuff' in the gas so it's more volatile.

It's not the liquid that ignites...it's the gas. In warmer temps, the liquid is more volatile and turns into a gas easier. In colder months....it's not as volatile. They put additives in the gas to make it more volatile.
And I'm sure, even after they put crap in it...it still isn't as efficient as it is in the summer without the crap in it.

Some neat information

http://www.exxon.com/USA-English/GFM/Products_Services/Fuels/Gasoline_FAQ.asp

And a map of certain gas mixtures,regulations, and gawd knows what else.
http://www.exxon.com/USA-English/GFM/Files/US_Gasoline_Map.pdf

 

i dropped about 7mpg at my last fill up....i hate winter gas

 

I was hovering around 13 mpg! I just sea foamed the tank and used it directly in the intake as well[along with a brand new set of plugs and air filter]. So far, it feels peppier. I used to have to give it gas to back out of my driveway, now it just idles out. It seems to accelerate better too. I won't know if it's really any better until I burn through another tank of gas.

P.S. Winter mixes of gas always reduce economy, and Ethanol SUX!