Hey lamebums. Good to see you on EM. Its a great place to get ideas when you've pushed as far as you have with driving style alone. Mods won't give you the improvements you've seen with driving style unless you go all out crazy, but there are definitly things you can do to improve mileage.
For the grill block I'd be completely comfortable blocking the entire upper portion of the grill. I'd go with a nice black coroplast over it with something similar to what I did with the Matrix (see my build thread). It would be very easy to make, decrease aero drag, and decrease warm up time. For winter, I'd probably mostly or entirely block the bottom section too. You'll have to watch the SG to make sure your coolant temps don't go too high and since you drive some city (IIRC) listen for your radiator fan when you come to stops. If its kicking in a lot you have too much blocked. The fan will start kicking in so much that it'll negate the benefits of the block. Grill blocks are a great place to start though.
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