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This is a discussion on Confessions of a pseudo hypermiler within the Gen II Prius Fuel Economy forums, part of the Gen II (2004-2009) Toyota Prius Forums category; Originally Posted by alanh Here's a thought: I've seen it said that on some conventional cars, if you're going downhill ...


Confessions of a pseudo hypermiler

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Old 07-22-2008, 04:07 PM   #11
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Default Re: Confessions of a pseudo hypermiler

Quote:
Originally Posted by alanh View Post
Here's a thought: I've seen it said that on some conventional cars, if you're going downhill with your foot off the gas, the car will shut off the injectors and not actually use any fuel. However, if you're in neutral, it will have to burn fuel to keep it idling.
Which cars would have that feature, how would one know if ones car did this or not?

Would a 1989 Integra have such feature? I've never heard of this before.
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Old 07-22-2008, 04:32 PM   #12
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Default Re: Confessions of a pseudo hypermiler

I believe all engines with electronic fuel injection have this feature.
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Old 07-24-2008, 09:52 AM   #13
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Default Re: Confessions of a pseudo hypermiler

There are many times when you should "dip the clutch" into neutral to control the car.. eg: when aquaplaning, sliding on "black ice" etc.. this removes the "engine braking" component from locking the front wheels and you then lose the steering. The Prius gets around this with the vehicle stability system.

Going down steep winding mountain roads is not the best time to "dip the clutch" either! The engine braking may save the brakes from overheating and also the car's center of gravity is altered when cornering round a sharp bend in neutral without braking or engine braking.

Safety regulations always err on the side of extreme caution IMHO.

Last edited by Dozzer; 07-24-2008 at 10:00 AM.
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Old 07-24-2008, 02:49 PM   #14
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Default Re: Confessions of a pseudo hypermiler

The Prii seems to no longer be the car you see moving slowly or slower than the pack. I see Prii on the road now and they are almost all doing as fast as the others. I guess people think it's the car that does the work of saving fuel? The Prii does a lot at what 46 to 49 mpg even if you drive it like a sports car?

I guess those folks are happy enough with that.
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Old 07-24-2008, 03:52 PM   #15
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Default Re: Confessions of a pseudo hypermiler

Well, the results are in. Our vacation trip of 5,901 miles from CA to NV, UT, CO, KS, MO, IL, IN, MN, SD, WY, NV and CA resulted in 52.8 MPG. We took the car up to 85 MPH briefly over the salt flats and it handled very nicely and felt as though I could have gone much faster if I wanted to. The CO mountains were no problem at all.

I drove at 55 MPH for about 95% of the trip. My back was a bit sore but overall it was a fun trip.
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