What highway speed is most fuel efficient?
55-65mph
The Energy Saving Trust says that the most efficient speed you can travel in a car in terms of achieving the best fuel economy is 55-65mph. Any faster, though, and the fuel efficiency decreases rapidly. For example, driving at 85mph uses 40% more fuel than at 70mph (oh, and it’s illegal too).
What should your highway RPM be?
For the best fuel efficiency, keep your RPMs between 1,500 and 2,000 RPM when driving at a constant speed.
Does keeping RPM low save gas?
Yes, a lower RPM can save some gas. That being said, torque is required to move the vehicle forward and increasing the RPM will increase the torque required. If the RPMs are not maintained to provide the required torque, the result is there is additional stress on the engine components and drive train.
Does cruise control burn more gas?
Generally speaking, yes. Cruise control can help you become more fuel-efficient and can help you save an average of 7-14% on gas thanks to its ability to maintain a continuous speed. In comparison, the constant change in acceleration and deceleration of the driver placing their foot over the pedals can eat more gas.
Which is the most efficient rpm for an engine?
For an output of 50% of the maximum horsepower of the engine, the most efficient operating point is about 63% of the maximum RPM – at 102% of the minimum fuel consumption. The most efficient operating point [fuel consumption/Hp] min for the engine overall occurs at 58% of max power, and about 69% of max RPM.
What should the engine RPM be at 65 mph?
At 65 mph it turned about 2000 rpm and got 15 mpg. When I picked up the pace to 75-80 mph it was turning 2500-2600 rpm and got 17 mpg. (plus I got home quicker!) One way to figure out what rpm your engine pulls best if you have a manual trans, use 2nd gear at about 1500 rpm push down on the throttle and watch the tach.
When does engine RPM affect gas mileage [ physics forums ]?
The most efficient operating point [fuel consumption/Hp] min for the engine overall occurs at 58% of max power, and about 69% of max RPM. This would be the desired operating point for a hybrid’s engine. Note also another motivation for hybrids – the terrible inefficiency of the engine as we approach the no load condition.
Which is the best rpm for highway cruising?
I was reading the article “Hitting the Sweet Spot” in the latest issue of Rod & Custom. It’s a helpful write up about optimizing highway cruising RPM with rear gear selection and overdrive. The article provides a formula to calculate RPM at any given MPH. It states that about 2200 RPM @ 75 MPH is a good target.