Dumbarton

Unleaded currently varies by roughly 12p per litre between the cheapest and dearest forecourts, which is enough to notice on a full tank. Supermarket forecourts from Sainsburys and Tesco usually anchor the bottom of the local range.

2 of the 6 local forecourts are supermarket-run, and the rest split between branded and independent operators. Tesco around Rockingham Rd has been setting the cheapest unleaded price locally of late.

Several of the busier sites sit along Dumbarton Road and Dunbarton Road, so you can check them against each other without leaving your usual route. Unleaded here currently averages several pence under the wider Central Belt figure.

For diesel, expect an average of roughly 168p per litre locally. Everything within about 8 km of the centre is included, so edge-of-town and retail park sites appear alongside the central forecourts.

Prices in Dumbarton can move mid-week as well as at weekends, so the ordering above is worth a glance even if you always use the same forecourt. The table below carries the exact live figures per station, and alerts can flag a drop at the forecourts you actually use.