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Old guy new to Eco 2001 Mustang Sport Coupe V6
I bought the car new and for a few years it would get 31 MPG Hi Way. Since then it has deteriorated to 22, I've wondered if it was because the engine wasn't designed for the current alcohol levels in the gas. At 50 K miles I installed new double platinum plugs and it appeared to get slightly worse mileage. It's hard to drive on the highway at less than 70 but I tried it today, so it is do-able. Looking for tips on checking programing, it passes smog perfectly, but maybe the tune can be changed? Has anyone tried advancing the cam timing? Much cheaper than hi compression pistons. Pat
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