The Reverend Bayes tells us that using the precondition "Honda with 200K+ miles, but no major repairs" will not give the average cost across all cars. What of the Honda owners whose car after 130K miles needed major repairs but decided instead to junk it and buy another car? Why focus on a compact car when so many people have bigger vehicles?
Okay, so AAA's calculator is insane. Got better numbers?
https://caredge.com/honda/maintenance says "Honda maintenance costs an average of $428 per year" but also shows the estimated annual costs exceed $428 after the 4th year, and reaches $1660 after 12 years, saying "Honda models average around $7,827 for maintenance and repair costs during their first 10 years of service." or $782/year, which is 1/3rd that of AAA.
For a 5 year old Civic, it estimates maintenance costs across the next 5 years as 601+752+1057+1178+1291 = $4,879 which is about $976/year or 10 cents per mile.
Is that more reasonable? It still shows that your estimate of max $.26/mile for fuel should be $.36/mile for fuel+maintenance.
And for some reason you don't want to include depreciation, even though mileage certainly affects warranty coverage, insurance coverage, and resale value.
Consider that Edmund's estimates a 2019 Volt Hatchback LT 4dr Hatchback to cost over $2,000 in maintenance and repairs in its 5th year. https://www.edmunds.com/chevrolet/volt/2019/cost-to-own/ (Also $2,000 for 2017 at https://www.edmunds.com/chevrolet/volt/2017/cost-to-own/ .) There's a jump in costs at the 5th year, I'm thinking because it assumes 15,000 miles per year, which means the the limited warranty and powertrain warranty have both run out by the 60,000 miles reached the 4th year.
Did you pay for your Volt in cash or did you finance? Was it new? What model year is it? How long do you plan to keep it? How often do you drive LA to San Francisco vs. your total mileage? How typical is your cost compared to others with the same model car?
All of these affect your true cost of driving beyond simple fuel costs.
Look, I totally get how you might prefer driving one of your cars to go to LA. But if you are going to justify it based on cost rather than personal preference you need to include the full cost, which is more complicated than just the price of fuel.