Mercedes-Benz G-Class Electric vs Porsche Cayenne

The Mercedes-Benz G-Class Electric costs £71,670 more than the Porsche Cayenne. On the headline specs that premium buys little measurable advantage - the two are closely matched on range, charging and space. The Porsche Cayenne is not just cheaper - it also offers 75 miles more WLTP range, 190 kW faster peak rapid charging and 161 litres more boot space. On EVcarsguide's combined category scores, the Porsche Cayenne comes out ahead overall.

The Porsche Cayenne is £71,670 cheaper to buy. The Porsche Cayenne is cheaper to charge, roughly £240 a year versus £280 for the Mercedes-Benz G-Class Electric, at 8,000 miles on an off-peak home tariff. Add 5 years of charging and the Porsche Cayenne comes out roughly £71,870 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 235 miles for the Mercedes-Benz G-Class Electric and 234 miles for the Porsche Cayenne - effectively matched, and both well below their WLTP figures because sustained high speed is the hardest case for an EV.

The Mercedes-Benz G-Class Electric is the easier car for tight UK car parks: it is 49 mm narrower than the Porsche Cayenne. In a standard 2,400 mm bay that leaves about 469 mm of total clearance for the Mercedes-Benz G-Class Electric and about 420 mm of total clearance for the Porsche Cayenne. The Porsche Cayenne also turns in a 0.9 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 G-Class Electric and 84% for the Porsche Cayenne. That is close enough that capacity loss should not decide between them. Both use NMC-type cells, so for daily use keep the charge limit near 80% to slow degradation.