May I suggest, since you appear to he in Rapid City, that you just stay on US 385 south of Hot Springs instead of swinging west on US 18. You'll get to see some beautiful country as you drop down through the Buffalo Gap National Grassland and into the Pine Ridge area around Chadron and the Nebraska National Forest. When you hit just north of Alliance, it is more than worth the 3 mile cut over to NE 87 to see Carhenge, which was one of the best places to watch the total eclipse of the Sun in the US a year ago for both duration and clearness of the sky. I was there, along with nearly 15,000 people from all over the US, Canada and Central and South America to watch it. Keep going south on 385 as it skirts the western edge of the Nebraska Sandhills, then cut over NE L62A and drop south on US 26 thru Bayard, cross the North Platte River and stop at the most famous and iconic landmark along the Oregon, California, Mormon and Pony Express Trails, Chimney Rock. Continue down US 26 to Bridgeport and catch 385 south to Sidney, NE - founding home of the famous outfitter, Cabela's (recently acquired by Bass Pro Shop
). Then drop south on NE 19/CO 113 into Sterling, CO and catch I-76 into Denver. A little bit longer distance and a couple of hours more time than I-25, but well worth it and quite doable in a short day of driving.
Unless of course your "tomorrow" when you posted at 2:41am today is actually today, in which case it's too late and nevermind.
As for your cold start problem that was resolved when you re-installed the factory tune, often times (and I'm saying this without knowing the details of Ferm's Economy Tune) an economy tune will advance the injection timing some to increase combustion efficiency - the downside being that doing so often makes cold starts harder (cold being up here cold, not Florida "cold") and the resultant injector clatter can be disconcerting if you've never experienced it before, you think you have an injector issue when it's actually due to the earlier combustion while cold.
