You could do a discreet grill block and use matching paint to make it look like it belongs there, I know some people have done that and it looks better then it did without it. As for other things, I would get a kill switch installed. That alone will help a lot, especially in the city part of your commute. Other then that, just adjust your acceleration and coasting distances and you will probably see a big improvement, I personally saw a big improvement in my camry when I had it. Went from 27-32mpg just slowing down from 75-70mph and being more careful in the city.
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