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                Chinese electric automobile startup Nio has demonstrated its new ES8 SUV to customers in Beijing, with home market sales already under way. priced from 448,000 yuan (around £50,500) after government incentives, it's not far off half the price of a Tesla model X in China.   Despite Nio only being founded by Shanghai-based NextEV in 2014, the ES8 is fully finished and offers comparable specs to a model X. It's a full seven-seater, with an all-aluminium body and chassis, air suspension on all models and all-wheel drive. Advertisement - article continues below • best electric automobiles to buy now Electric motors…