10-4 by WEX

Review by eFreeware

Fuel is the single largest running cost for most people who drive for a living, and diesel prices swing enough between one stop and the next that where you fill up matters as much as how you drive. An app that puts discounted diesel stations on a map along your route, rather than sending you hunting through loyalty programs one chain at a time, addresses a real problem rather than a hypothetical one.

That is the space 10-4 by WEX occupies. It comes from WEX, Inc., and it sits in the Auto & Vehicles category on Google Play. The developer's pitch is simple: find diesel, pay less for it, and keep a record of what you saved. It is free to download, carries no ads and has no in-app purchases.

The app has been installed more than 100,000 times and holds a 4.3 average across 1,615 ratings, with 244 written reviews.

Finding diesel that costs less on your route

The core of the app is a nationwide fuel map. You use it to locate diesel stations, and the developer lists a set of well-known truck stop names among the places where discounts apply: Love's, TA Petro, Circle K, Speedway and Racetrac. For a driver running a regular lane, that mix covers a good share of the stops you would already be choosing between.

What I like about the framing is that it does not ask you to change how you drive. The map is there to show you where the savings are along the route you were already taking, rather than pushing you toward an unfamiliar network. Whether the discount at a given stop is worth pulling in for is a judgment you make stop by stop, and having the options visible in one place is the point.

The developer says drivers saved an average of $377 a month in fuel using the app, based on app data from October through December 2025, with the caveat that actual savings vary. That is a marketing figure and should be read as one: your own numbers will depend on how much diesel you burn and which of the participating stops sit on your routes. Even so, it gives a sense of the scale the developer is claiming for regular users.

Paying at the pump with a fuel code

The payment flow is built around activation rather than a card swipe. Once you are at a station, you activate the purchase and pay using what the developer describes as a secure fuel code. The idea is that the discount is applied when you pay.

The developer is explicit that there are no transaction fees and no monthly fees, so the discount is not being partly clawed back through a service charge.

The app also keeps a record of your fuel purchases, rewards and savings, which turns it into a running log of what you bought and what it saved you. For an owner-operator tracking cost per mile, that record is arguably as useful as the discount itself, since it removes some of the manual bookkeeping that comes with fuel receipts.

Getting set up and what it asks of you

Setup follows the sequence the developer lays out. Getting started means signing up and linking a card. That card is the payment method the app uses when you activate a purchase at the pump.

From there the routine is: open the fuel map, find a station along your route, activate at the pump and pay with the fuel code, then check the purchase and savings in the app. It is a short loop.

The most recent update added the ability to pay using Google Pay, alongside bug fixes. If you already keep a payment method in Google Pay, that is one less card to enter by hand.

The drivers this suits

This is built for people whose fuel bill is a business expense. Truck drivers, independent owner-operators and contractors are the audience it targets, and the feature set lines up with that: a national map, discounts at truck stop chains, and a purchase log.

If you fill a diesel tank once a week on a fixed route, the value depends on whether the participating stops are the ones you already use. A driver running long-haul lanes across several states has more chances to hit a discounted stop than someone doing short local runs, simply because there are more stations in play.

I would also expect the savings tracker to appeal to drivers who currently keep a shoebox of receipts or a spreadsheet. Having the purchases and rewards in one place is a small convenience that adds up over a year of regular fueling.

A free tool worth trying for regular diesel buyers

10-4 by WEX is a focused app that does one job: cut the cost of diesel and keep a record of it.

The case for installing it rests on your fuel volume. If diesel is a recurring, significant cost and you drive routes that pass Love's, TA Petro, Circle K, Speedway or Racetrac locations, the potential return is straightforward and the setup is quick. If your fueling is occasional or happens at stations outside that set, the app has less to work with.

It suits truck drivers, owner-operators and contractors who want discounts applied at the pump and a clean record of what they spent. Anyone in that group who buys diesel regularly has little to lose by creating an account and seeing what the map shows along their usual routes.

What's new in version 1.3.0

Pay using Google Pay Bug Fixes