I have a 2015 40XL with the 360 + Jeep Commander.
Recently I returned from a trip of about 10,000 miles including the US Rockies and Canada.
There was no problem along the way including driving in the mountains.
The simple math shows = $ 7,000 (minimum difference) / 3.0 $ (average price per gallon) = 2,333 gallons
Relaxed driving fuel consumption is abut 8.5 miles per gallon, that means nearly 20,000 miles !!!!
If you ask me,,,,, I would have stayed with the 360.
p.s. This is exactly what I need for the next trip begins in New Orleans,, West Coast to Alaska and back