Downtuned

Its getting colder outside, and im starting to use the heat in my 06 IS. I was wondering, does anyone else see a significant change in gas mileage when using their heat? My tank average was sitting at 25.0 regularly, and now its around 23.5 with no real change in how I drive. Is this common?

kickin8

iTrader: (1)

that has something to do with the fuel blend.....

355F1

Yep.

http://www.popularmechanics.com/cars...rence-13747431

Downtuned

Very interesting, I did not know that. Thanks!

jdmSW20

iTrader: (12)

yeah in the winter the fuel blend is different. thats why youll sometimes hear folks refer to it as "summer gas" and "winter gas". i dont think that should really really affect mileage, not in a major way at least

Noeh

iTrader: (3)

+/- 2 mpg for me, I think it's mostly due to cold morning start ups.

Downtuned

same here regarding the +/- 2. I was under the impression me running my heater had something to do with it as well, but I cannot say for sure.

nabbun

we already take a mpg hit for using ethanol blends. we take a further hit due to winter blends.