Is there any reason not to use UNL 88? It’s an E15 blend that’s 88 Octane. It’s normally $0.33 or 15% cheaper here than E10 87. Both of our cars say you can use up to E15. (2019 Honda Insight and 2020 Toyota Highlander Hybrid).
been using it in our 2005 Jeep GC and 2014 Chrysler T&C for a couple years now. I agree on the pricing you see in Nebraska, it is the same here in eastern Iowa. Mileage was not greatly impacted in either case either...
One thing I noticed and not sure of root cause yet, but the 2005 jeep does start a little harder in the cold. Not sure if I need to check plugs or what but just an observation. The 2014 T&C is fine.
At 15% cheaper than E10, and in cars that allow its use, I'd use it.
Most places here only have a 5 cent difference between E10 87 and E15 88. The decrease in fuel mileage from decreased energy content doesn't make it worth it at that small of a difference in price...