Tankbook: Fuel Log & MPG

Log a fill-up in 10 seconds. No account, no login, no limit on vehicles. Tankbook is a simple fuel log and gas mileage tracker. Enter the odometer and any two of price, amount or total — the third is calculated for you. Your MPG (or km/L, or L/100km) is worked out only between full tanks, so partial fill-ups and a missed fill-up don't wreck your numbers. WHY TANKBOOK • No sign-up. Open the app and start logging. Nothing to log in to, ever. • Unlimited vehicles. Car, bike, the weekend car — all free. • Honest fuel economy. Full/partial toggle and a "missed a fill-up" checkbox keep the average accurate. • Any two of price, amount and total — the third fills itself in. • Your units per vehicle: miles or km, gallons (US/UK) or liters, MPG, km/L or L/100km. SEE WHERE THE MONEY GOES • Home: average fuel economy, last tank, fuel cost per mile and fuel spent this month. • Log: every fill-up and car cost by month — parking, tolls, car wash, service, insurance. • Stats: fuel economy trend, monthly fuel spend, distance, fuel used and lifetime car costs. YOUR DATA STAYS YOURS • Everything is stored on your phone. No server, no account. • Export to CSV and open it in any spreadsheet. Import CSV to move to a new phone. • Undo when you delete something by mistake. LITTLE THINGS • Home screen widget with your last MPG and a one-tap "+ Fill-up". • Optional fill-up reminder N days after your last tank, with quiet hours. • Light and dark theme. Tankbook is a gas log, mileage log and car expense tracker in one — built for people who want the numbers, not the jargon.