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believe it or not the 18" wheels that I have are a smaller diameter than stock (17"). Due to the smaller rubber band tires(225/40/18) its 3% smaller in over all diameter.
Once i upgrade the tires to (235/45/18) I should be within 1% difference to the stock setups in the winter. My main gripe with them are the weight, I can imagine the weight difference is.. more than the diameter in this case.
Once i fix my rear brake issue, I am going to get into the rear diffuser.
I just hope my dreams of 28-30 MPG is possible one day.
By the way I am driving right now I dont see how I can get it much better from the 24.9 MPG right now.
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