FYI, the original poster on this french language forum gets it: fuel economy
and improved "performance" (of the enthusiast rag definition). You can tell by the thread title:
Quote:
"AeroCivic (EG) 2.5 L/100 km - 140mph, Site web maintenant en ligne"
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AeroCivic (EG) 2.5 L/100 km - 140mph - Club Civic Quebec :: Forum