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The WrenchTime blog
Notes on looking after a car or a motorcycle: what a service interval really asks of you, how to read your fuel economy, why a mileage log earns its keep, and where the app fits. Each article answers one question in its first paragraph and is written to be read on its own.
What is the best free vehicle history report?
No free report matches Carfax on its own, but NICB VINCheck, an NMVTIS check, NHTSA's recall lookup and a listing's free report together cover most of it.
How to improve gas mileage
Driving habits beat every product: smooth driving and lower highway speeds save the most, tires, oil and roof racks come next, and gadgets do nothing.
How long do EV batteries last?
Fleet data shows EV batteries lose about 2.3% of their capacity a year and rarely need replacing, so most outlast the 8-year, 100,000-mile warranty.
CarPlay gauges: live OBD2 data on your car screen
How to see live OBD2 readings such as RPM, boost and coolant temperature on CarPlay, why most apps show a list, which apps draw gauges, and which adapters work with iPhone.
Motorcycle chain maintenance: clean, lube and adjust
Clean and lube a motorcycle chain every 300 to 500 miles and after rain, check slack every 500 miles, and replace chain and sprockets together at the wear limit.
How often should you rotate and balance tires?
Rotate every 5,000 to 8,000 miles or at the interval in the manual; balance when a tire is mounted, a weight is lost or the car vibrates. Plus AWD, EV and Tesla rules.
Best CarPlay apps by category (2026)
The best CarPlay apps for navigation, music, podcasts, audiobooks, messaging, EV charging, parking, weather and car tools, plus the three ways an app reaches the car's screen.
What is the best mileage tracker app?
MileIQ, Everlance, TripLog, Driversnote, Stride and WrenchTime compared on free limits, prices, how a trip starts on its own, and what each one is for.
How often should you change coolant?
Every 2 years or 30,000 miles for older green coolant, five to ten years or 100,000 miles and more for long-life types, whichever comes first, with the manufacturer numbers side by side.
What maintenance does a hybrid car need?
A hybrid needs the same servicing as a gas car plus a few hybrid-only checks, mainly the battery's cooling intake and the inverter coolant, and it usually costs no more to maintain.
What is the best OBD2 app for iPhone?
Six OBD2 apps for iPhone compared on price, adapter, readiness, Mode 06, manufacturer modules, CarPlay and logs, from what each developer states.
How to use an OBD2 scanner
Plug in with the ignition off, switch to on without starting the engine, read and write down every code, and look each one up before clearing anything.
Is Torque Pro available for iPhone?
Torque Pro is an Android app with no iPhone version; the App Store apps that use its name come from other developers. What to use on iPhone instead.
What an IRS compliant mileage log needs
Date, destination, business purpose and miles for every business trip, written at or near the time, plus total miles for the year and the right 2026 rate.
How to calculate gas mileage
Divide the miles between two full tanks by the gallons it took to refill, then average over at least three tanks by totals, never by per-tank figures.
Which car maintenance records should you keep?
Keep every invoice and parts receipt with the date, mileage and work done, for as long as you own the car, because no outside report can rebuild that history.
How often should you change motorcycle oil?
Every few thousand miles or once a year, whichever comes first, with your owner's manual setting the exact figure and hard riding or storage shortening it.
What should an iPhone car maintenance app do?
Keep one record where mileage, service, fuel, charging and trips inform each other, on your phone and without an account, not a calendar with an oil-change icon.
Level 1 vs Level 2 charging: which do you need?
Level 2 is about five times faster and wastes a little less energy, but Level 1 is often enough for a plug-in hybrid or a short commute with a long night parked.
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