Welcome aboard and congrats on the xD...I had a long a$$ response typed out and I accidentally erased it so I said screw it...Spend a few hours searching through all the old threads on here and I'm sure you will find the answers you are looking for...
And for what it's worth, I have got 18x8's that are fairly heavy, a big a$$ custom built sound system, and a ragtop, and still average around 33-34 mpg with mixed city/freeway driving...Oh BTW, I have an automatic...
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