Originally Posted by idrive

I almost started a thread on this a month or two back. I've always noticed a drop when the winter gas hits but this year seems to be even worse. I've gone from 18 mpg on average to 16 with no changes in my driving. I agree the cold helps add to the loss but it sure is more noticeable this year.

One of the biggest killers is idling. If you're letting the truck warm up much that could easily be the difference along with the winter gas, lower tire pressure etc.