Hi, what Frank said. I grew up in western Michigan. Nothing like MN, but cold to me. Having owned 4 Toyo's thru the years, I've noticed that they warm up to operating temp very quickly. If your Echo is not at oper temp in a few blocks, 1 mile plus or minus, then replace your thermostat.
As Frank said, aero won't do much at your speeds. But, low speed stop and go is where weight reduction makes a difference. So, you may want to ponder that a while. I'd suggest a warm air intake, but it is already running lean, so not till that is fixed.
No mud flaps or mud guards, they just grab the frozen slush.
Your biggest gains look to be coming from timing the lights as well as you can, in heat retention, and in weight reduction.
Best of luck. Let us know what you do and how it turns out.
Good luck.
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