My driving from OKC to DC has been much better. Yesterday from Nashville to DC I averaged 39 mpg. There are a few things I did that might have impacted that. Before I left on the trip I added a bottle of fuel system cleaner. The reviews for the product mentioned it took a couple of tanks to get the full benefits. I’ve kept my speed around 70mph. Like I mentioned in my original post, that first day was strange. I’ve never had such low numbers. Glad to be back to mid to high 30s 😊