Increased Magna consumption

After David McKenzie told us that his TJ Mitsubishi Magna used up   to 40 per cent more fuel when running on E10 than it did on regular   unleaded we felt we should refer it to the experts, as his experience   contradicted the advice we had received about the fuel. David's   experience confounded the experts who said it went against everything   they knew about the fuel. They told us that Mitsubishi had no   problems with the TJ Magna using E10. Further we were told that   providing the oxygen sensors were working correctly the engine   management system on the Magna would adjust for any changes in the   fuel. It was suggested that David have the fuel-injection system in   his car checked by a competent mechanic.