BYD Dolphin vs MG MG4 EV: home charging cost

At the July 2026 Ofgem price cap (26.11p/kWh), the BYD Dolphin costs less to charge — it is the cheaper of the two to run at 6.7p per mile vs 6.9p for the MG MG4 EV — a difference of about £15.68 over 10,000 miles of home charging.

Prices based on the Ofgem price cap of 26.11 p/kWh, effective 1 July 2026.Source: Ofgem

	BYD DolphinComfort 60.5 kWh	MG MG4 EVSE 51 kWh
Full charge cost	£17.95	£15.07
Cost per mile	6.7p	6.9p
20-80% on a 7 kW wallbox	5 hr 11 min	4 hr 37 min
Usable battery	60.5 kWh	50.8 kWh
WLTP range	265 miles	218 miles
Efficiency	4.4 mi/kWh	4.3 mi/kWh
Max AC charging	11 kW	6.6 kW

At a glance

Full charge cost (lower is better)

BYD Dolphin£17.95

MG MG4 EV£15.07

Running cost per mile (lower is better)

BYD Dolphin6.7p

MG MG4 EV6.9p

20-80% time on a 7 kW wallbox (lower is better)

BYD Dolphin5 hr 11 min

MG MG4 EV4 hr 37 min

The bigger battery costs more to fill but is not necessarily more expensive to run — cost per mile depends on efficiency, not battery size. Costs include ~12% AC charging losses, and both figures rise in the cold — typically 10–30% in winter. On an off-peak tariff both cars cost roughly two thirds less per mile.