Prius (Gen 3) Fuel :: Using Electric Only And Pulse Hard Maximize Commute?


Apr 15, 2011

When I first bought the car I was resetting the trip/mpg every day and getting a daily reading. Then I started to realize that wasn't accurate as a per tank reading. So now I judge my weekly trip/mpg. Currently I am getting 57-59 mpg on the MFD(I do not have a scangauge yet) - so i guess that would equal 54-57 actual.

My commute is 43 miles one way. half of it is mixed city driving a mile of low speed out of my neighborhood to a 55 mph with two 2 mile 35 mph zones and then the second half is interstate.

I have been working on keeping the SOC high for the 55 mph so that i can most of the time slip in and out of high speed "stealth" mode. Usually with the MFD around 69-75? and not drop speed too quickly. maybe a mph per 2 miles depending on the grade.

I try the pulse and glide in the 35 mph zones. coast in, then glide as far as I can and pulse back up. I have been playing with a couple ways,

OPTION 1: use in electric only-takes longer and kills SOC.

OPTION 2: Pulse hard into el+ICE and its crap mpg for a small amount of time. Pulse gently into ICE and decent mpg for a little longer amount of time.

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Did use cruise control to maximize battery changing when coasting to a red light or slowing down for a speed zone? Just keep in mind your vehicle will slow down fairly rapidly with no brake lights- so I tend to to do this during those glorious moments when there are no cars behind mine. When you see an approaching red light (with cruise control on) just hold the cruise control switch down and the vehicle will automatically power the generators to max. In this way you will not lose any potential battery charge to the actual brake pads. Be advised also the generators will stop and the cruise will cancel automatically at 22mph which is usually slow enough to avoid engaging the brake pads until you are pretty much stopped. Just thought I would share a neat trick with fellow hypermillers. **Also note this may be a less effective charging method than long drawn out braking but is most effective for rapid slowdown situations like unanticipated red lights, speed zones or expressway off ramps ect. and requires some skill to do safely.

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I'm relatively new with my 2011 Prius. I've been averaging about 53.6 mpg, but I feel as if I can do better. I've set 54 mpg as this "magic number" that I'm aspiring to, but if I ever reach that, the number will probably rise to 55 and so on ... (As an aside, if I just set the cruise control while on the commute I'm about to describe, I get the same mileage as I do when I'm working on hypermiling, so I don't know if it's worth the effort with this route).

My daily commute is around 15 miles. About half of this is a hilly and curvy road. The PSL on that portion is 55 mph, and it is a two-lane (one lane in each direction) road. At least one of the hills are so steep that if I DWL, I'll lose between 15 to 20 mph from the bottom to the top; that's with the HSI "pegged" right before the power section of the line. I can maintain speed, or at least lose less, if I go into the power area. Additionally, there are several curves at the bottom of the hills where I must brake down to around 40 mph to safely negotiate the curve.

Finally, it is well-trafficked road as well, so, while observing the speed limit, I may have 10 cars piled up behind me, which makes me nervous.

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Nexus 7 ?

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I am a new 2010 prius owner and I am very interested in obtaining the max MPG in my new car I have read and seen video with regard to the pulse and glide method. My question is

1. can you shift into neutral on the glide
2. can this do any harm to the car.

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Two weeks ago we were driving across rolling hills in southern Ohio. I started to wonder, "What would be the perfect road for the Gen 3 Prius?" Is there a road shape that would allow the benefits of pulse and glide without the speeding up and slowing down?

Let's assume no net elevation change on an interstate highway and a driving speed of 60 or 65 mph. To stay in the most fuel efficient engine ranges for the ICE, we'd want down-hill stretches where the power demand shown on the hsi would be in the bottom 1/4 of the total Echo range, and up-hill stretches where we could stay in the top 1/4 of the hsi Echo range (just below Power).

Would the optimal ascent and descent angles be the same, or would the angle of decline be shallower that the assent angle? Would mileage (mpg) be better on this ideal up and down road than mileage on a flat road at constant speed?

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Correct me if I'm wrong - Pulse & Glide is not really possible at speeds higher than, say 120-130km/h (74-80mph). I have noticed on my last trip that if you want to keep 130km/h average and you pulse up to 140km/h and glide down to 120km/h, when "gliding" the engine never shuts down, and the glide period is very short.

When pulsing back to 140km/h it takes a "long" time and the instant fuel consumption is "high" (e.g. 6-7L/100km) while when "gliding" you are actually at 2-3L/100km, which means on average you are at about 5L/100km, which is what I would get in any case if keeping speed constant with the CC at 130km/h.

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Prius Plug-in 2012-15 :: Using EV Mode To Pulse And Glide Above 42 MPH?

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