when you are cruising) but if you demand acceleration you will burn a lot of fuel to get very little. Ideally, driving the car at a high gear, just shy of the midway mark on your tachometer is when the fuel efficiency is the maximum (i.e. Your fuel efficiency is best when you are not over working the car. This rpm range need not be the same as that for optimal engine life. This can also increase your fuel efficiency since frictional power loss is minimized. This naturally means you have parts that run smoother and longer. Since the vibration is minimum at this rpm, the wear and tear in the engine is minimized and so is the friction between engine components. This is when your engine vibrates the least (Think of this as the opposite of that point when your entire car begins to shake violently due to excess load). The rpm range for the two can be different).Įvery engine has a least resonant rpm. It is in fact true that driving at slightly (key word) higher rpms is much better (for both fuel efficiency and engine life.
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