How to Estimate Fuel Volume for a New Gas Station

Estimating how many gallons a site will sell is the single most important number in a gas station deal — and the one people get wrong most often, because they start (and stop) with the traffic count. Here's the method that actually predicts volume.

Step 1: Start with the traffic — but don't stop there

The passing traffic (measured as AADT — annual average daily traffic) is the raw pool of demand. It's the starting point, not the answer. The mistake is treating a big number as a big forecast. A busy road is a necessary condition, not a sufficient one.

Step 2: Apply a capture rate

The number that matters is capturable traffic — the share of those cars that can and will actually stop. That capture rate is driven by:

Two sites with an identical traffic count can have very different capture rates — which is exactly why the raw count is a poor predictor. (More on this in why high traffic doesn't equal high fuel volume.)

Step 3: Convert to monthly gallons — as a range

Capturable traffic, combined with the trade area's demographics and the fuel brand/price position, converts into projected monthly gallons. A credible estimate is a low/mid/high range, not a single figure — the future is a range, and a suspiciously clean number is a red flag, not precision.

Step 4: Sanity-check against the frictions

Finally, check the number against what caps a site: an approved competitor down the road, a saturated market, or a trade area that's drifting. A forecast that ignores the frictions runs hot. (This is the same reason a full feasibility study weighs access and competition, not just the count.)