Audi S6 Avant e-tron vs BYD Sealion 7

The Audi S6 Avant e-tron costs £49,935 more than the BYD Sealion 7. For that premium it adds 94 miles more WLTP range, 120 kW faster peak rapid charging and 175 kW more power. On EVcarsguide's combined category scores, the Audi S6 Avant e-tron comes out ahead overall.

The BYD Sealion 7 is £49,935 cheaper to buy. The Audi S6 Avant e-tron is cheaper to charge, roughly £176 a year versus £216 for the BYD Sealion 7, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the BYD Sealion 7 comes out roughly £49,735 cheaper overall. These figures cover list price and home charging only - insurance, servicing, tyres and depreciation will move the real total.

EVcarsguide estimates a real-world motorway range of about 328 miles for the Audi S6 Avant e-tron and 204 miles for the BYD Sealion 7 - both below their WLTP figures, because sustained high speed is the hardest case for an EV. The Audi S6 Avant e-tron goes roughly 124 miles further between charging stops. Both rapid-charge to 80% in a similar time, around 21-24 minutes.

The two are within 2 mm on width, so neither is meaningfully easier to thread into a tight space. In a standard 2,400 mm bay that leaves about 477 mm of total clearance for the Audi S6 Avant e-tron and about 475 mm of total clearance for the BYD Sealion 7. The BYD Sealion 7 also turns in a 0.6 m tighter circle, which helps with U-turns and multi-storey ramps.

Over a 8-year ownership window EVcarsguide's degradation model projects roughly 84% battery health for the Audi S6 Avant e-tron and 90% for the BYD Sealion 7. That gives the BYD Sealion 7 a modest edge in retained real-world range. The BYD Sealion 7's LFP-type pack tolerates daily 100% charging, while the Audi S6 Avant e-tron's NMC-type pack lasts longest kept to about 80% for everyday use.