Plein

Plein is the simplest way to track your fuel consumption, costs, and mileage across all your vehicles. Log every fill-up in seconds — just enter your litres, price paid, and distance driven. Plein instantly calculates your consumption in L/100km (or UK MPG), your average cost per litre, and your total spending over time. What Plein does: Track multiple vehicles in one place Calculate fuel consumption automatically (L/100km or MPG) Monitor your spending per fill-up and over time Compare consumption across your fleet Export your data as CSV anytime Works fully offline — no account needed Your privacy matters: Plein stores everything locally on your iPhone. No servers, no accounts, no tracking. Your data is yours. Supports metric (L/100km) and Imperial UK (MPG) units. Available in English, French, Spanish, and German.