Posted by Steve@Advance on August 01, 2021 at 12:40:29 from (99.190.215.237):
In Reply to: Mileage question posted by rrlund on August 01, 2021 at 07:16:45:
There are several factors, wind being the biggest.
But the engine design and gearing are also critical.
Modern engines use every available technology to get the best mileage under the widest range of conditions. Variable valve timing is one advantage, cylinder canceling is another. Fuel mixture is the big one.
Generally engineers shoot for max efficiency at around 60 MPH, because that is the most practical highway speed.
So varying from that speed will change the mileage results. Going slower will reduce wind drag, but the engine will not be running in it's optimum power band. Going a little faster will put the engine in a more efficient RPM range, but the wind drag will increase. Going a lot faster will put the engine beyond it's best RPM range, wasting energy trying to breathe, and huge increases in wind resistance!
Lower engine RPM also does not equal better mileage. Correct final gear ratio is essential for optimal efficiency. Problem is loads and conditions vary greatly. Gear it too tall, it will take more throttle opening. Gear it too low, still more throttle opening to feed the wasted effort. Just like riding a bicycle, it has to be right to be comfortable.
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