Match like with like
Do not compare regular petrol with premium or diesel, or a member-only price with a general cash price. Use tax-included yen per litre where possible.
Freshness matters more than rank
This guide shows a price as current only when it has a source and was confirmed within the last seven days. Even then, the station can change it before the page updates.
A detour also has a cost
Driving farther for a small per-litre saving may use time and fuel. Consider route, opening hours and how many litres you need.