Close the grille in increments and monitor the temps. You'll be surprised at how much it can be closed off with no ill effect- IF you aren't towing to full capacity through Death Valley.
I'm told an extended air dam can help. I haven't done it though.
Slight nose-down rake is said to be good aero. Too much can't be good though. Got coil springs on the back? They can be compressed with clamps. Lowering supposedly helps but the effect is quite small. Don't spend a lot of money to do it if your purpose is to save money on gas.
Aerocap would be the best aero mod to make, by far.
Narrow tires are BETTER for snow. How long have you lived in the Midwest? Don't go narrow for fe though. It probably won't pan out.
You don't have to buy a NEW bike. I have bought good bikes from Craigslist for $500.
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