Kia EV6 vs Kia EV9: home charging cost

At the July 2026 Ofgem price cap (26.11p/kWh), the Kia EV6 costs less to charge — it is the cheaper of the two to run at 6.7p per mile vs 8.1p for the Kia EV9 — a difference of about £134.13 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

	Kia EV6RWD 77.4 kWh	Kia EV999.8 kWh RWD
Full charge cost	£21.96	£28.19
Cost per mile	6.7p	8.1p
20-80% on a 7 kW wallbox	6 hr 21 min	8 hr 9 min
Usable battery	74 kWh	95 kWh
WLTP range	328 miles	349 miles
Efficiency	4.4 mi/kWh	3.67 mi/kWh
Max AC charging	11 kW	11 kW

At a glance

Full charge cost (lower is better)

Kia EV6£21.96

Kia EV9£28.19

Running cost per mile (lower is better)

Kia EV66.7p

Kia EV98.1p

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

Kia EV66 hr 21 min

Kia EV98 hr 9 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.