2018 GC HA
Your fuel mileage at 80 mph is not shocking at all. I'm not sure how you can expect to get anywhere near the rated 25 mpg when you are going that speed for 370 miles. When the EPA tests these things to determine mileage, it is nowhere near what you will achieve in the real world. The average speed for the highway test is about 48 mph, maxing out at 60. Then there is a high speed test done which is still at an average of 48, but maxing out at 80. Both of those are done with the AC off. I drive about 55,000 miles per year for work and I cannot achieve 25 mpg unless I am in the low 70's. I typically drive at 78-80 and never really do any better than 22 mpg. And that is in Ohio which is pretty darn flat. Correct me if I am wrong but driving from Utah to Cali would take you through some pretty hilly/mountainous terrain, wouldn't it? That in itself would kill your mileage no matter the speed.I'm pretty shocked at how bad the mileage on my V6 2020 trailhawk is vs what the sticker said. I just did a 370 mile all hwy drive from St George Utah to SoCal and only averaged 19.4 mpg (calculated, 19.1 gallons), the trip computer said it was 20.1. Set the cruise at 80 and did it pretty much the entire way home so I was expecting pretty good results. That's pretty bad considering it's supposed to be closer to 25mpg on the hwy. Around town I'm only getting about 15. And I drive this like an old lady around town (my wife on the other hand...) My Mustang GT does better than this thing. It's only got 2000 miles so hoping it improves as it breaks in but so far I'm not impressed with the mileage.