Hmm...maybe not...I just assumed they did because of the price fluctuations between winter and summer...they must do that just for fun
I'm debating doing the Seafoam treatment...but as I said before I'm a tad intimdated by the procedure. I'll read up on how others have done it though and see if I'm up to the task.
I'm thinking I need to do some other things that might help my gas mileage. I've already done the AFE filter (and doing the deckplate mod soon) and I use Lucas fuel treatment in every tank. I have new plugs and wires (don't know the last time they were changed) that I'm going to have put in when I do my timing belt. I guess all that really leaves is the fuel system...including possible Seafoam-ing and fuel filter replacement. Hoping one or all of these will help my gas mileage since it's gone down since I got the cap put on it.
In May 2012 I averaged 22.6 mpg, June 2012 23.1 mpg, July 2012 22.7 mpg and Aug 2012 22.8 mpg.
If my topper isn't on after I go through the next tank and the mpgs are above 23 again... I might seriously consider trying to store the topper in my garage unless I need it.