Markham — including Unionville — is served by stations along Highway 7, Kennedy Road, Woodbine and Markham Road, plus the 404 and 407 interchanges. Prices generally track a touch above the York Region lows set in Vaughan and the Scarborough discount corridor just south, so the practical question for many Markham drivers is whether the station on their commute beats the ones across Steeles.
The honest answer changes daily, which is what the ranked list below is for: every Markham and Unionville station we track, cheapest first, refreshed hourly. If you regularly drive the 404 south, glance at the Scarborough area page too — the Costco gas bar at Warden and the Kennedy Road independents are a short detour off the highway and frequently undercut everything in Markham.