Why Plug-In Hybrids Rarely Match Their MPG Claims

20 Feb 2026 | Abstracted from Autoblog

A German study finds plug-in hybrids use up to three times more fuel than manufacturers claim. WLTP tests start with a full battery, letting PHEVs run much of the cycle on electricity, inflating MPG figures. In real driving, engines activate more often - sometimes at high revs - to recharge the battery, sharply increasing fuel use. Toyota, Kia, Ford, and Renault performed closest to claims, while luxury brands like Porsche and Bentley fared worst.

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