[Billfitz]

You have it backwards. The engine would run hotter in ECO or COMFORT for better fuel economy, cooler in SPORT/+ for better acceleration. That's why the concept of the Italian Tune Up is flawed. Forty years ago we called it 'blowing the carbon out', driving at high speed in a low gear for maximum RPM. It may have worked then, long before direct injection and computerized engine heat management, but all it would do today is waste fuel.