Mercedes-Benz GLB vs XPENG G6 (2025)

The Mercedes-Benz GLB costs £6,110 more than the XPENG G6. For that premium it adds 109 miles more WLTP range, 105 kW faster peak rapid charging and 2 more seats (7 versus 5). On EVcarsguide's combined category scores, the Mercedes-Benz GLB comes out ahead overall.

The XPENG G6 is £6,110 cheaper to buy. Running costs are almost identical - about £176 a year either way, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the XPENG G6 comes out roughly £6,030 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 268 miles for the Mercedes-Benz GLB and 193 miles for the XPENG G6 - both below their WLTP figures, because sustained high speed is the hardest case for an EV. The Mercedes-Benz GLB goes roughly 75 miles further between charging stops. A rapid charge to 80% takes around 20 minutes in the Mercedes-Benz GLB and 12 in the XPENG G6, so the XPENG G6 loses less time at each stop. So the Mercedes-Benz GLB stops less often while the XPENG G6 stops for less time - pick on which you would rather do.

The Mercedes-Benz GLB is the easier car for tight UK car parks: it is 59 mm narrower than the XPENG G6. In a standard 2,400 mm bay that leaves about 539 mm of total clearance for the Mercedes-Benz GLB and about 480 mm of total clearance for the XPENG G6. The Mercedes-Benz GLB also turns in a 0.4 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 Mercedes-Benz GLB and 90% for the XPENG G6. That gives the XPENG G6 a modest edge in retained real-world range. The XPENG G6's LFP-type pack tolerates daily 100% charging, while the Mercedes-Benz GLB's NMC-type pack lasts longest kept to about 80% for everyday use.