New PiP Owners...More data please!!!

Another great result.

33.7 kWh is equivalent to a gallon of gas.

You used 38 kWh and if we include the ~15% charging loss, that's 43.7 kWh used to save 3.2 gallon of gas.

A worthy trade like these make Prius PHV a step toward the right direction (progress).

 

I own a regular Prius but like to keep up with the PiP. I was just curious how the mpg of 82.2 mpg is calculated. If you took the 38 Kwh (forget losses) and divide by 33.7 Kwh (equals 1 gal) you would get 1.13 gallons equivalent. If you add the 1.13 gallons to the 7.75 gallons pumped, it equals 8.88 gallons.

Now divide 637.1 mi by 8.88 gallons you get 71.7 mpg. Am I missing something here? Also how does it come up with 3.2 gallons saved?

 

Well, i'm no Phd on the internal math in the display, but i'm thinking that the 3.2 gal saved is based on the EV miles driven, 195 miles, divided by mpg, in this case 60.9375 mpg.

It may be that the computer senses driving habits and computes ice only mpg for each driver's particular habits and history.

the 82.2 mpg is gasoline only mpg; not taking any EV miles or kwh for recharging into account.

Oh, and my kwh rate is about 11 cents, so i spent about $5.11 on electrons to recharge the Pip.

any way you cipher on it, it's a darn fine vehicle.

 

What you calculated is the composite (gas+electric) MPGe. He got 72 MPGe on his last tank. For reference, EPA rates Volt as 60 MPGe composite.

I think the owner's manual said it is approximate. I find it conservative.

In HV mode, his tank averaged 56.26 MPG (436 gas miles / 7.75 gallons). He drove 195 miles on EV.

195 EV miles / 56.26 MPG = 3.47 gallons saved / avoided.

195 EV miles / 50 MPG = 3.9 gallons saved / avoided.

 

Actually, that would not be MPGe, as estimations of MPGe uses power as measured from the pump/wall -- i.e. including charging losses. For that particular trip CrewDog efficiency was approximately 70.2MPGe, not 72.

If you want to see data on many drivers check out the PC chat Plug in Prius Spreadsheet
discussed in this thread PIP & MPG Spreadsheet | PriusChat

Note the PiP does not have an official EPA MPGe rating, though I estiamte its EPA-styple MPGe between 58 and 59MPGe.. Crewdog is just a moderately more efficient driver. (The Volt may be EPA rated at 60.. My last tank was 96+MPGe.. and my current is over 105MPGe).

 

PageMillRoad or White Shadow,

Please ID yourself.
In the MPG sheet, we need you to fill in ALL the cells. Not just the Miles and Gallons.

Thanks,

 

yesterday, i went 16.2 miles before the ice kicked in. myrange after charging is up to 15.1.

 

These photos from my latest tank refill tell an exciting story:



It's quite fulfilling to see results like that.

You don't need to do much to get great efficiency.

 

very nice. yesterday, i srted with 15.5 miles ev range and went 16.9 miles with .3 left on ev.

 

Got a photo of my recent EV delight:

 

that's a beautiful thang! what was the ev range starting out?

 

yesterday, i took my bride to the eye doctor. started out with full charge, 15.5 miles, 88 degrees, a/c on all the way.
dropped her off and went to the garden center to pick up a few things. went back and picked her up and went to a nursery for some flowers. when we got home we had driven 12 miles and had 2 left on the ev range. so the a/c and 2 people in the car used up arounf 2-3 miles of range.

i plugged back in because i had to leave for work in a couple of hours. when i checked it, it said 'charging at 1 kwh. seemed low, although i had not looked at that before. the house a/c was on and i wonder if that reduces charging power?
anyway, after 2 hours it was upto 14.4 which didn't seem too bad and i made my usual commute of 15 miles with no a/c and had .2 left of range when i got home.

 

13.7 miles. The resulting 17.5 obviously exceeded the estimate by quite a bit.

Yesterday, I started the same way. The result was 15.2 miles. Outcome definitely varies. There's simply too many factors at play for the estimate in your driveway to be really accurate.

 

Very nice, my last tank was 103 MPG!!!! This is the best car on the planet!
How many times per day did you charge on average?

 

Detail is available from the spreadsheet on my website.

1.5 times was the average. That 37.5 times divided by 24 days for the tank (8 gallons).

 

today, my range estimate hit 16.0 miles. i'm getting 17-17.5 actual miles on a regular basis. i think everything is broken in and the range is slowly catching up to my actual driving. this car is more than i expected and could have hoped for!

 

309 Miles, less than 1 Charge.

I had an absolutely wonderful excuse to drive up to central Minnesota today. It was an errand that had to be done, so why not make a day of it, see the sights along the way? And that's exactly what we did.

I started with a full charge and used EV only when traveling in city & suburb conditions. The highway travel was all HV. The entire trip was 309 miles. I used only 70 percent of the EV available, resulting in 4 miles still remaining once we got home. I was thrilled with the results. Without any effort, the efficiency was great. The final average after all that distance ended up 58 MPG.

With all the undermine attempts over the years claiming the battery-pack being worthless for long-distance travel and the weight of it causing a penalty, results like this certainly stir some emotion. They were very, very wrong. Antagonists certainly don't have much to misled with anymore. The design is proving very, very effective.

 

The Truth About Cars!

2012 Prius Plug-in!

August 27, 2012

 

nice color!

 

Its certainly not unreasonable to believe that the Li pack does improve HV efficiency. The key does seem to be significantly lower internal resistance of the battery, reducing voltage sag and energy lost to heat. This is partially due to the larger capacity of the pack, but battery chemistry and specific design will factor in as well.

An example of the observed improvement can be seen in the testing of the PIS 10kW conversion of a 2009 Gen II Prius, which yielded a charge sustain mileage of 62mpg on the city/UDDS and 65mpg highway.
Plug-In Prius Conversion MPG and Emission Test Results | Plug-In Supply

Here's another interesting comparison of simulated charge sustain mpg on the US06 and UDDS cycle for various battery chemistries with packs of the same weight, showing up to 8% lower fuel consumption for Li vs. NiMH as well as better Wh efficiency in charge depletion mode. It also demonstrates the improvement in both factors when using a larger pack.
Electric and Hybrid Vehicles: Power Sources, Models, Sustainability ... - Google Books

So its reasonable to speculate that both larger pack capacity and battery chemistry are factors in producing the lower pack resistance that can result in better HV mileage in CS mode.

Rob