CarvicoFuel economy
How to calculate MPG by hand
The full-tank method, the partial fill-up trap that ruins most homemade logs, why your dashboard reads optimistic, and a calculator that runs in your browser.
Diagnosis · 10 minYour gas mileage dropped
Cheapest checks first: tire pressure and season before oxygen sensors and dragging calipers — and how to tell a real drop from tank-to-tank noise.
Maintenance
Maintenance schedule by mileage
What 30k, 60k, 90k and 100k really include, the items that expire on the calendar instead of the odometer, and four questions that separate a real interval from an upsell.
Template · 7 minFree car log template
Two CSV files for Excel, Sheets and Numbers — no email required — plus the formulas, including the one that handles partial fill-ups correctly.
Money & resale
What your car actually costs per mile
The five components, a calculator using your own numbers, the national benchmark, and why running cost and total cost answer different questions.
Resale · 10 minDo service records increase resale value?
The percentages everyone quotes are unsourced. The mechanism is real: documentation removes deductions rather than adding a premium. What to keep and how to hand it over.
Choosing tools
Choosing a car maintenance app
Six checks before trusting one with a decade of history, where the well-known apps stand as of July 2026, and how to read a privacy label in 60 seconds.
SwitchingLeaving Fuelly
Export your fuel history in three steps and import it without losing partial fill-ups, units, or years of odometer readings.
SwitchingLeaving Simply Auto
Same three steps for Simply Auto's export — including what its MPG method did to your historical numbers.
The app behind the guides
Carvico is a private car logbook for iPhone: fuel with real full-tank MPG, service history, receipt scanning, reminders that use miles and months, and CSV/PDF export. Your records stay on your iPhone and your own iCloud — we run no server that holds them.
Download on theApp Store