What is the best RPM for fuel economy?

Shifting up at 2,000 rpm (1,500 rpm for diesel) gives the best mix of speed and economy. On an automatic with manual shift, short shift to save fuel. The heavier the car, the greater will be its thirst.

What can cause high fuel consumption?

Common Causes Of Excessive Fuel Consumption, That May Or May Not, Turn On Your Check Engine Light:

• Sluggish Oxygen Sensors.
• Inaccurate or Defective Coolant Sensor.
• Defective Engine Thermostat.
• Engine Misfire.
• Intake Manifold or EGR Valve Leak.
• Worn or Fouled Spark Plugs.
• Dirty Fuel Injectors.
• Low Compression.

Do higher RPMs mean more fuel consumption?

Thus higher RPMs mean more fuel consumption for a defined period of time. and the tires were directly connected to the engine (no transmission), then it is possible that the fuel consumption per distance traveled would be the same for any engine RPM.

Is it bad to run a car at a high RPM?

No… the problem is that for the same power output, running at higher rpm means running at lower load. And the engine’s efficiency and fuel economy is extremely dependent on load. So running high rpm in itself isn’t an issue… but running high rpm at low load is an issue. To give a feeling for where highway power levels are…

Does changing the speed on the tachometer affect fuel consumption?

The only things you really can try to infer from your tachometer would be the higher your RPMs, the more likely it is that you are burning more fuel assuming all other factors are the same. If you change your cruising speed to keep the tach at 2000 RPMs instead of 2500 RPMs, then yes, you will probably save fuel.

Is it better to keept engine revs to low or high?

There are plots that can be looked up for a typical engine’s torque output versus rpm and fuel consumption. It is typically better to keept the revs as low as possible, but it is certainly possible for fuel consumption to start getting worse before the engine starts lugging.