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2026-05-14

Why odometer-based mileage tracking beats GPS for gig drivers

GPS-based mileage trackers drain your battery and overcount short trips. Here's why the IRS doesn't care, and what to do instead.

If you've ever driven for DoorDash or Uber with a GPS-based mileage app running, you know the feeling: phone hot to the touch, battery at 30% by 2pm, and a mileage log that somehow shows you drove an extra 17 miles you don't remember driving.

There's a better way, and it's what the IRS has actually wanted all along.

What the IRS actually requires

For the standard mileage deduction (67¢/mile in 2025), the IRS requires a "contemporaneous log" with:

  • The date of each trip
  • The business purpose
  • The total miles driven

That's it. There's no requirement to record GPS coordinates, route, or speed. A start-of-shift and end-of-shift odometer reading covers all three requirements perfectly.

Why GPS gets it wrong

GPS mileage apps have two problems gig drivers don't talk about enough:

  1. Battery drain. Continuous GPS is the most expensive thing your phone does. On a 10-hour driving day, you'll burn through 40–60% of your battery just keeping the tracker alive.
  2. Phantom miles. GPS apps interpolate between fixes. When you sit at a red light or wait at a restaurant for an order, the app often "smooths" your position and adds miles you didn't drive — or, depending on the app, undercounts because of signal loss.

Either way, you're either losing battery for an inaccurate log, or you're spending evenings cross-referencing with Google Maps to clean it up.

The odometer method

Two photos per shift. Start, end. Total = end – start. Done.

In ShiftTracker the workflow is:

  1. Tap "Start shift" — snap your odometer.
  2. Drive.
  3. Tap "End shift" — snap your odometer, enter your earnings per platform.

The app does the subtraction, tags the shift to a platform, and rolls everything up into a Schedule C-ready PDF at year-end. No background GPS. No phantom miles. No battery drain.

When GPS might still make sense

There's exactly one scenario where GPS-based tracking is worth the battery cost: if you genuinely cannot remember to log start/end odometer readings and you'd rather pay 50% battery than miss the deduction entirely.

For everyone else: the odometer method is cleaner, more accurate, and audit-friendly.