Fast or Slow Acceleration? Test Results
As a new aspiring hypermiler, I have been doing a lot of reading online. Every now and then I come across a post where someone refers to a recommendation by BMW suggesting that brisk acceleration up to speed will give better overall fuel efficiency that slow acceleration.
I just wanted to share the results of some informal testing that I did with my new Civic EX. My conclusion: While the numbers may not be extremely precise, I think the trend is fairly clear (and predictable). Slower acceleration over a longer distance will save you more fuel than quick acceleration over a shorter distance. At least it does for my Civic with CVT. You can see my methods and results at Acceleration Experiments | Civic MPG. Sorry, can't make this a link since I am a newbie. --Chris |
So w/ the CVT at the slow, med, and high (1.8K, 3.3K, and 5+K RPM), it was held at said RPM the whole time? Because I think that might be what is killing your MPG far more than throttle position itself!
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The CVT is a different beast than traditional transmissions. It is capable of loading the engine before increasing engine rpm which is a big efficiency benefit. Automatics increase rpm (and load) as throttle is increased. Manuals increase load as throttle is increased.
Still, good testing, thanks for doing it! It would be interesting to see what load the engine is at at those rpm ranges. |
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I know that is how it works on the Prius with its e-cvt. As soon as you're off idle rpms, your engine is optimally loaded.
I'm not exactly sure how OEMs are programming normal CVTs. But, theoretically, that is how they can work. |
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I enjoyed doing this little experiment and am planning to do more as time permits. I will include some load and / or throttle position experiments. |
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Thanks for putting that link in there Doax!
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Nuverde, you don't have an Ultragauge? This would be a great and cheap way for you to get great data, such as load and a ton of other things, including reading trouble codes.
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