Finnish manufacturer Wärtsilä introduced an engine back in 2015 that was so good, it snagged a Guinness World Records title for being the most efficient four-stroke diesel engine shortly after its ...
Geely now holds a Guinness World Record for thermal efficiency, with its new i-HEV system rated at 48.4%, according to a report from Car News China. That figure represents how much energy from fuel is ...
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