By Victoria Waldersee BERLIN (Reuters) -German premium carmakers reported sales at or above forecasts for 2023, with BMW topping deliveries but Mercedes-Benz set for the highest returns margin, in a sign of varying strategies towards going electric. Volkswagen’s Audi began closing in on competitors with total unit sales of 1.9 million vehicles, but battery-electric sales remained far behind at 178,000 to BMW’s of more than 375,000 and 240,600 at Mercedes-Benz. Mercedes said on Thursday its fourth-quarter sales took a hit from supply constraints and model changeovers, but full-year car deliveri…