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Cold weather, ICE vs. HEV
HEV may take a bigger percentage hit due to:
1) the inherent loss of efficiency the ICE experiences in cold weather
2) HVAC heating demand forces ICE to run when it otherwise wouldn't
3) when hybrid batteries are cold (NiMH < 50°F), the battery utilization is seriously throttled thus reducing the hybrid efficiency, primarily in regenerative braking.
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