The 30,000 mile Ram 1500 hemi test vehicle that Edmunds.com has reported an average lifetime mpg of 14.7, including some towing and a high of 21mpg for highway for their hemi. Obviously not a direct comparison, but their 20,000 mile Kia Telluride SUV test vehicle average lifetime mpg was 19.3. The 3.6 in my 2018 durango GT averaged 22-23 in mixed highway/city with a heavy foot over 3 years, which is better than the EPA average.
So, the difference between a hemi and telluride average lifetime is close to 5 mpg and this includes some towing with the hemi. Of course, their driving may not be the same as yours, but it is worth noting because it is average lifetime mpg over at least 20K miles, a decent sample.
The Kia has an 18 gallon tank, so it will go 347 miles @ 19.3 mpg. For the same amount of fuel, the hemi will go 264 miles @14.7 mpg. This means you can travel 83 miles further in the 6cy Telluride or 4.3 gallons of gas to the positive of the Telluride, or a savings of $15.05 @gas price of $3.50 per gallon.
I drive 1200 miles a month, pretty even mixed driving highway/city, so for me that's 81 gallons per month or $283 per month in gas. For the Kia, it amounts to 62 gallons per month, or $217 per month in gas, a grand total difference of $66 per month, which I can afford and come on, a hemi vs. Kia 6 cylinder?
I just wanted to put this out there because if you are shy of the amount spent on gas owning a truck and think you will do lots better in a mid-sized SUV, then I'm thinking the delta between the two is not all that great, and when you consider the many options you have with using a for real 4x4 truck with a hemi vs. a mall crawler and the long term reliability of a truck, then for me a truck is the way to go, even if I use it as a daily commuter with occasional playtime. Oh, and hemi vs. Kia 3.8 6 cylinder? 11K tow rating vs. 5K.
I don't know, if the hemi gas puts you off, I'd look at the Durango 3.6, it can tow more than other mid sized SUVs and the 3.6 is venerable. I thrashed mine and it never quit.
Obviously, your mileage may differ, but the 14.7 mpg reported by Edmunds seems pretty reasonable after looking at the threads in this forum, so I used those numbers.
Overall, having to pay $66 extra a month for a hemi seems to be worth it considering its a hemi, its a truck with all the options of using it, and there are loads of places to have it repaired no matter where you are at, parts availability and general long term use of the vehicle is high.
A long read, but I hope this helps put in perspective for those on the fence of owning a truck and think they may save lots of gas going with a SUV and while you will save some, you'll be missing out on a whole lot of hemi/truck goodness.