Grill blocks and the cowl over the wipers and removing the top rack are easy to do and will probably do the most for you. You should also consider removing mud flaps if you have them since they're just big air dams behind the wheels. The other thing to consider is how you drive. Don't forget the big saying around here. "The biggest FE mod you can make is to adjust the nut behind the wheel". Drive more slowely and more conciously. Read up in the Ecodrivers Ed area for tips on how to drive more fuel conciously.
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