Gas vs Diesel ownership costs

Getting a new super duty in a few weeks and am in between the 6.7 Powerstroke and the 6.2 gas. I have crunched some numbers below for fuel and maintenance costs based on 100k miles. Just looking for feedback on this math. I know I could probably settle with gas, but I want the diesel. Currently have an 05 6.0 F250

I’ll be towing a roughly 8300 lb camper through Washington state with frequent trips being through the mountains.

Two trucks I’m looking at:

2021 F350 XLT 6.7 10spd 3.31 63k miles Certified gold warranty from ford $46,915

2022 F250 XLT 6.2 6spd 3.73 5k miles Certified gold warranty from ford $43,000

FUEL Calculating the 6.7 at 17mpg and the 6.2 at 12mpg. Per 100k miles

6.7 = $22,411 @ $3.81 per gallon 6.2 = $28,416 @ $3.41 per gallon

MAINTENANCE 6.7 oil, filters, fuel filters, DEF = $5006 6.2 oil, filters = $1480

TRADE VALUE AFTER 100k miles for both taking an older year and adding 100k to each

6.7 @ 163k =$34,000 6.2 @ 105k =$28,000

Initial cost + maintenance + fuel after 100k miles of owner ship: 6.7 = $74,417 6.2 = $72,896

Obviously the 6.7 will have a better resale value than the 6.2. Without accounting for any other general maintenance, this seems accurate to me. I would also install the disaster kit and run additives on the 6.7 which adds maybe another 700$. I’m also not accounting for any emissions related costs on the 6.7. I know people who are over 200k with no emissions issues and on the stock CP4

Am I crazy for going with diesel with such a light trailer? I figure if I’m spending the money, I might as well get the truck I want. I also plan to keep it for awhile. Any advice is appreciated