High RPM get much worse nearing max RPM. Max RPM is the limit that the engine can take before severe damage. Running at or near max RPM for extended periods will drastically reduce engine life. Engines are usually more efficient at lower RPM as well.

Running an engine some 3000 RPM below its redline should be absolutely find for extended periods of time. So long as your oil and coolant is in good condition, timing belt in good order etc, then most engines will handle this sort of driving for hours per day.

around 2000 RPM

RE: Normal RPM range @ 50mph? 1780 rpms, read off digital scanner connected to the OBD2 port, at 70 mph. 1500 rpms for 50 mph sounds about right. your overdrive works.

4000 RPM

Faulty speed sensor Automatic vehicles use speed sensors to determine when the gear should be shifted up or down. In the event that a speed sensor doesn’t work correctly, your car might not shift gears when it needs to. This can cause high RPM as the engine has to work harder.

The clutch may be wearing out or is worn out. Other components in the transmission may be failing. The transmission fluid level is low. The transmission fluid pressure is low.

if you want to lower your rpms on the hwy then add a tooth to the front or take away from the rear. figure out your indicated speed vs your actual speed (either with gps, a cop friend, or one of those radar trailers). this will be a PERCENTAGE. so the faster you go the more it will be off.

This failure consists in a sudden short-time engine drop when changing gears. For a second, you might think that you’ve run out of fuel….INSTEAD OF A CONCLUSION.

What is even more imperative than matching cable length is that you do not mix up the order of the spark plug wires. Improper installation of these wires can result in poor combustion or misfiring of the cylinder, which will cause drivability issues and potentially severe damage to the engine.

For the purposes of a misfire the issue could be a lack of fuel at high revs or poor fuel delivery. Lack of fuel could suggest possibly a poor fuel pump, clogged fuel filter or if you have replaced all of your fuel lines with flexible ones, that you have a kink in the hose.

While you may be able to keep driving for a while if your car has a misfire, in the end, it’s really not a good idea. Sometimes, a simple fix, such as replacing a spark plug, can solve the issue, so if your car is misfiring, don’t ignore the problem it it will only get worse (and more expensive).

On average, after driving 15-20 minutes, the average misfire counts range from 0-20 — but occasionally one or two cylinders will be 80-100. Funny thing is the offending cylinder on one trip might be normal the next, and a previously normal will be high and then go back to normal again.

An engine misfire can be caused by bad spark plugs or imbalanced air/fuel mixture. Driving with a misfire isn’t safe and can damage your engine.

50,000 miles