Holy moly yeah you got this down ...that's wassup and good to know for me I put in about $45 to $50 once a week I drove 5 days a week 34 miles roundtrip . Then weekends we use wife's Tesla . This is waaay better then my Audi I used to have $50 every two days lolThe car quoted MPG are also a bit off. Mine always reads high compared to a hand calculation when I fill up my car.
I take 15-30 seconds to fill out a spreadsheet when I get gas before resetting the trip computer. Also, the trip computer when you reset keeps track of the last few tanks (assuming you reset trip A on refill).
Helps me understand the empty light info, driving habit trends, any drift as the engine ages, and how awful the trip computer is (~1 mpg high like my 9th gen Civic).