AUSTIN, Texas In March, Alexandre Ponsin set out on a family road trip from Colorado to California in his newly purchased Tesla, a used 2021 Model 3. He expected to get something close to the electric sport sedan’s advertised driving range: 353 miles on a fully charged battery. He soon realized he was sometimes getting less than half that much range, particularly in cold weather – such severe underperformance that he was convinced the car had a serious defect. “We’re looking at the range, and yo...