PARIS (Reuters) – Sales of kits that let gasoline engines run on ethanol are surging in France, as drivers switch to using the sharply cheaper crop-based fuel at a time of soaring oil prices. Self-styled market leader FlexFuel Energy Development says it delivered 6,400 conversion kits in the first 22 days of March, up 80% from 3,468 in February and nearly three times January’s 2,166, data from the company showed. Ethanol producers say other firms in the same market have recorded similar increases. “People think now is the time, there really is interest in switching to ethanol,” Sylvain Demoure…