Mpg / fuel cost tracking history

I currently use a separate app that I input my ODO / gallons filled / price per gallon at every fill up to track lifetime statistics. I feel this app could integrate something similar to track that info natively! :)

The issue does not name files, tests, or an existing entry point. Start by reviewing the project structure and clarifying which odometer, gallons, price-per-gallon, and lifetime statistics workflows are required. Done should mean an agreed scope and an implemented native fuel-cost history feature with defined statistics and verification.

Written by the indexing model from the issue text.