Hey gus I would look into getting your speedo checked. 20-22mpg with a set of 35's on it. And you are claiming you are getting that around town. Sorry but I think you maybe writting for Aesops Fables

 

I've got 4.10s and the NV5600, but I have 315s. I get around 16.5 - 17 normal driving, and I have seen as high as 18mpg on a longer highway trip.

 

as stated in my prior post, yes speedomiter is off..but i am basing it on the fact that i drive the same route every day, every trip (41miles) and i verifyed every thig w/ gps before and after the tire swap, so yes i feel my #'s are corect, and they are not just based on 1 or 2 tanks, its based off of an verry thuro fuel log. if i were to be getting that milage based on the current spedo calibration, id be seeing 25+mpg...
as far as trafic conditions, it is mixed driving, I5 here in the PNW is rated in the top 5 for worst trafic in the country, ie: to get from the main Boeing building to my house (20.5 miles) generaly takes 45 min on a verry good day, and some times takes as much as 3 hours. trust me, you shuld see my clutch leg, just for fun one day i countd pushing it in over 100 times in a mile.
and yes, average fill up for me takes right about 35 gal and i do it usualy betwen 700-775 miles on a tank. i have run it lower once when i forgot my wallet and pushed 790 out of it...