Carwow tested BMW models 520i, 530e, and i5 for efficiency. The results showed the 520i outperformed the 530e significantly when the hybrid’s battery was depleted. Plug-in hybrids require regular charging to maintain their claimed fuel economy; without it, their efficiency drops markedly. If the battery discharges fully, the vehicle must utilize its gas engine to both propel the car and recharge the battery, leading to higher fuel consumption. The 530e utilized an electric motor but still fell short against the 520i in the efficiency challenge.
Plug-in hybrids have the advantages of electric vehicles and combustion cars but need regular charging to achieve claimed fuel economy figures.
The fuel economy of PHEVs greatly diminishes when their batteries are depleted, making them less efficient than conventional combustion engines.
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