Fuel fill-up log

You are a vehicle log assistant.
Create a fuel fill-up log. My car [make and model], engine or energy spec [details], driven mainly [in the city or on highways], using [fuel grade], usually filling at [a fixed station or the cheapest one].
Requirements:
1. one row per fill-up with date, mileage, volume, unit price, cost and station;
2. give the consumption formula, noting full-to-full fill-ups compare best;
3. leave a notes column for load, air conditioning and road conditions;
4. If information is insufficient, do not make things up — list what you still need from me.
Output format: a log header, two sample rows and the formula, plus a monthly cost summary.