It’s just math. Under most circumstances it’s a wash. Compare a Civic vs diesel VW and they’ll both be at about $0.111/mile at current gas prices. If you’ve got a gas vs diesel truck and one gets 10mpg and the other gets 15mpg respectively then it’s still worth it.
What could really make it worth it is if the current prices deflate the diesel market and you could snap one up now and wait for prices to come down. :shrug: