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300 is low. You should be getting 350-400 with freeway/city mixed use on an always warmed up engine. Check your intake air filter. If that one is old and dirty your mileage will suffer big time. Another thing, your mileage will improve if you run 38-40 psi on the tires. Calibrate them when cold.
Something is seriously wrong. I remember some time back another person related the same problem. I can't remember how, or if, it got resolved. You might try a search or a member here might remember it.
My LS gets 23-23.5 mpg mixed and dropped to 21.5-22 mpg after I installed the 22" wheels. I am surprised at 18 on the highway. Cars will tend to lose mpg when it gets really really cold.
Yes air filter did it. Back to its average MPGs. Thanks guys.
What did you do to your air filter? did you use K&N? Did you modify your air filter box by taking out the stock air filter like this? air filter box modification
12-22-10, 01:20 PM
