The pump price is only half the story. Fuel Fighter ranks stations by True Cost — what you actually pay when you factor in the fuel burned getting there.
The price at the station doesn't include the fuel you burn driving to get there. A cheaper station 10 km away can cost more overall than a pricier one around the corner. Likewise a station that's slightly more expensive but on the way to your destination could save you money.
True Cost accounts for that, ranking every nearby station by the real total you'll spend:
total litres = litres to get there (and back) + litres to fill
fill-up = pump price per litre × total litres
trip cost = fuel burned to reach station × pump price
eff. rate = true cost ÷ total litres