My Ram 1500 did this, and I second the feeling of feeling like I can drive forever.My Toyota Sienna recently imploded(5/8/22) on a large deer on the highway relieving me of the burdensome 16mpg at $5.15 gallon.
My new to me 2012 Outback 2.5 premium CVT gets a wonderful 29 mpg. I feel like it can drive forever between fill-ups and it's cheaper than my van every time.
You should look into heat rejection tint.The best mileage I got so far was 22.5, with a mix of city/highway and my last was 21.9. I drove a lot of city traffic so my average MPG as indicated in Fuelly is skewed a bit on the downside. I was also only having to fuel once every two weeks, but now I fill up every weekend, so my tank will generally last the entire week. I've been bitching to the local traffic county engineers over a traffic light that will constantly go to red with no cars present, which is a pain. Stop and go is just a pain when there are no cars present at the intersections.
I've really had to push the A/C to MAX during the past couple of weeks too, because of heat indices above 105 degrees F.