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I've always wondered about PHEV vs ICE engines -using a Skoda Octavia as an example, and their own site as source about MPG (big pinch of salt here), the diesel wins over the Hybrid model for mpg ( and CO2 emissions comparable).
So if you're doing long journeys, then the diesel is 'better', but if only short round-trips, the PHEV might be pip the diesel (if you've got access to a charger).
seager
Ima disagree.
Weight is a marginal efficiency factor on long trips at steady speeds, it matters most when accelerating. Wind resistance is most critical, so a slippery hybrid is going to give better motorway MPG than a fat non-hybrid.
And the weight isn’t as different as you might think. As an example a Skoda Octavia PHEV weighs 1600kg which is about 150kg more than a petrol version (9% or so) and is less than a Tesla 3.
More complicated and expensive to run yes, that’s another reason I don’t want one.