Hello all. I've had my HCHII since May 2007, and have been getting on average 47-49mpg per tank. Putting snow tires on in December (Blizzak WS-60 on lightweight alloys) dropped that down to about 38mpg. I understand that increased friction/rolling resistance and low temps will take their tall on FE, but should I be seeing that much of an impact? The route is the same 15miles every way, mixed highway/town roads, with hills in several spots. Even on warmer days I am seeing sub 40mpg numbers lately. Tires are at 34psi. The car has about 10k miles on it so far. I am thinking next step is checking air filter and also fuel- I've read that some gas stations now sell E10 fuel in NYS, and that could have a big FE impact. Comments/suggestions?