A fuel receipt looks like the easy case. It's short, it's freshly printed, and there's a big number near the bottom — surely a scanner can't get that wrong. And yet the pay-at-pump slip is one of the receipts I'd most tell you to glance at twice before trusting the draft. Not because the paper is hard to read, but because a fuel receipt is one of the few everyday slips that prints two prices right next to each other and dares you to tell them apart. Here's why gas and petrol receipts trip up receipt OCR in their own specific way, how to capture one so the right figure lands in your books, and the tax wrinkle that decides whether a fuel receipt is worth capturing at all.
Why a fuel receipt is its own hard case
Most receipts have one headline number — the total — and a scanner's job is to find it. A fuel receipt has two numbers competing for that spot, and they're both formatted like money:
- The rate. The price per unit — 3.49 per gallon in the US, something like 102.40 per litre in India — printed large and proud, because at the forecourt that's the number you're shopping on.
- The sale. What you actually paid — the rate times the volume you pumped. This is the figure your books need, and it's often smaller on the slip than the rate line is bold.
Receipt OCR is really two jobs: reading the characters, then working out which of them is the total. The reading is easy here — pump receipts are crisp. It's the understanding step that has a coin-flip to make, because "3.49" and "52.30" are both prices, both near the bottom, and only one of them is what left your account. When a fuel receipt comes back with the wrong amount, this is almost always why: the extractor grabbed the rate, not the sale. It's the same "many numbers that look like the total" trap that makes any receipt hard to parse — fuel just stages it more cleanly than most.
The number you confirm is the sale, not the rate
So the two-second habit for a fuel receipt is specific: glance at the drafted amount and check it's the sale total, not the price per gallon or litre. There's a quick sanity test that works in either country — the rate is a per-unit price and the sale is rate times volume, so the sale should be the larger, "rounder" transaction number (you rarely buy exactly one gallon or one litre). If the amount Starlog drafted matches the small per-unit figure, that's the tell, and you fix it in one tap.
This is the whole shape of how the app is meant to be used, and fuel makes it obvious. Starlog runs OCR on your device to pre-fill the store name and the amount — and then leaves every field editable, precisely because the amount is a draft, not a verdict. On a clean office-supply receipt the draft is usually right and you just confirm it. On a fuel slip you check which of the two prices it picked. Same motion, slightly more attention, because this is the receipt where the guess goes wrong most predictably.
The pay-at-pump slip has a second problem: it barely lasts
Fuel receipts pile a second difficulty on top of the two-number one. The slip a pump spits out is usually the flimsiest thermal paper in your wallet — narrow, faintly printed, and destined for a hot car. Thermal print fades to blank, and a fuel receipt left on a dashboard in July is close to the worst-case version: thin ink, direct heat, exactly the conditions that wash a slip out in weeks rather than months.
Which points to the same fix that works for every fragile receipt — capture it before it degrades. Snap the pump slip at the forecourt, or in the car before you drive off, while the print is at its darkest and the amount is unmistakable. Giving the OCR a clean, flat, well-lit frame matters more on a faint fuel slip than on almost anything else, because there's so little contrast to lose before the number becomes a guess for you and the scanner.
The workflow, start to finish
Nothing exotic — the point is that fuel behaves like every other receipt once you've settled the amount:
- Capture it at the pump. Photograph the slip on the spot, or import the emailed PDF if you paid through an app. OCR drafts the station name and an amount off the image.
- Confirm the sale total. Check the drafted figure is what you paid, not the per-unit rate, and correct it if it grabbed the wrong one. Set the date from the slip.
- Categorise it as vehicle or travel. Fuel usually belongs in a vehicle or travel bucket; putting it there on the spot means the totals build themselves and you're not sorting at year-end.
- Tag it to the trip, if it belongs to one. A tank of fuel for a specific client visit or job can go into that report, so the whole trip totals itself instead of leaving fuel scattered across the month.
- It files into your own Drive. The image lands in your own Google Drive, in the per-business year-and-month tree, next to every other receipt — and it's there in the export you hand your accountant.
The tax half: fuel is where the mileage decision bites
Here's the part that decides whether you should even keep the slip — and it's the reason fuel is worth its own post rather than a line in a general guide. Fuel is the one expense that sits directly on top of the mileage-versus-actual choice, and getting it wrong means either lost deductions or double-counting.
In the US, if you claim the standard mileage rate for a vehicle — 72.5 cents a mile in 2026 — that rate is already an all-in figure that bakes in fuel, along with maintenance, insurance, and depreciation. So you do not separately deduct your gas receipts on top of it; doing both is double-dipping. Fuel receipts only become a deduction if you use the actual-expense method instead, where you total your real vehicle costs and deduct the business-use share. Which method wins is its own decision, and it's worth making deliberately — but the practical upshot for capture is simple: if you're on actual expenses, every fuel slip counts and you want them all; if you're on standard mileage, the fuel receipt isn't your deduction, your mileage log is. Confirm which method you're using with your CPA before you decide a fuel receipt doesn't matter.
A note for India: petrol, diesel, and the GST you can't claim
In India there's no official standard mileage rate, so for a business vehicle, fuel is an actual cost that goes into your books against the bill — keep the slips. But there's a GST wrinkle specific to fuel that's worth knowing before you get your hopes up about input tax credit: petrol and diesel currently sit outside GST, taxed under the older VAT-and-excise regime instead. That means a petrol or diesel receipt generally carries no GST for you to claim as input tax credit — the tax on that slip isn't the creditable GST that a proper tax invoice for other purchases would carry. The fuel bill is still a legitimate business expense for your books; it just isn't an ITC opportunity the way a lot of your other invoices are. As always, the specifics turn on your situation and the rules shift — confirm the treatment with your CA.
What Starlog doesn't do here
To be straight about it: Starlog is a receipt tracker, not a mileage tracker. It won't count your miles, work out your business-use percentage, or decide the standard-versus-actual question for you — those are yours, or your accountant's. What it does is the part that's genuinely easy to lose: it reads the station and drafts the amount off a faint pump slip, lets you set the true sale total in a tap, and files the original image in your own Drive so the evidence outlives the paper. The deduction math is a decision; the vanished receipt is the thing you can't get back.
The takeaway
A fuel receipt fails in a way almost no other receipt does: it prints the rate and the sale side by side, and a scanner reaching for "the total" can grab the wrong one. So use OCR for what it's good at — reading a crisp slip and drafting a figure — and take ownership of the one check that matters here, that the amount is the sale you paid and not the price per gallon or litre. Capture it at the pump before the thermal print fades, categorise it as vehicle or travel, and let it file itself. Then make the deduction decision on purpose: on standard mileage the slip is backup, on actual expenses it's the deduction — and either way, the receipt is safe in your own Drive when you need it.