Question on MPG

Yes, the MPG number provided (CONS) does include miles spent on electric power alone (EV)

There is no 'gas MPG value alone' figure displayed in a Prius PHV. Because it never runs on gas alone. PHV is still a hybrid in HV mode, no matter how you look at it. Even the Prius (non plugin) doesn't run on gas alone .

It will show you the EV/HV driving miles ratio percentage .

PHV doesn't seperate the MPG consumption figure because either way its not running on just gas. It runs either fully electric or hybrid electric. The two are seperated for a miles-driven ratio, but not overall MPG.

The only way to get the number I think you are wanting is to deplete the EV range, fill up and not charge. You'd see the car's HV MPG.

And I think PHV will still get better mileage than a regular Prius, because HV electric battery (capacity, range, partition, regen, whatever) is greater in Prius PHV

 

This display might have the closest to what you're after?

You got miles traveled and kwh or gallons used for both.

I prefer to think of 'gas miles' as miles run on gas as an energy source, and 'electric miles' as miles that have grid electricity as the energy source. Potential energy and source of grid electricity can make the line not as clear cut, but that's another matter. Blended mode of course throws in another wrench in there.

By the same reason, I consider all miles in a regular prius as gas miles - it may have a partial electric drive and be able to bank energy in a battery, but the source is gas only just the same. It's not like you need to think about whether the regular prius's mpg is inflated due to other sources of energy.

 

The best way to compute HV MPG is to use the miles driven in HV mode against gallons on a fill up. For an estimate between fill ups divide miles driven by the consumption MPG to get the gas used. This will get you a better gallon number than on the ratio screen that does not show the partial gallons.

I reset one of the trip meters and ratio sets at each fill up.

iPad ? HD

 

or just subtract out ev range used on that trip and recalculate manually. it's not exact, but fairly close. or if you note the ev miles on the screen above at the start of a trip, and at the end, it will be more exact.

 

If this is from your PiP you should post it over on the Top 20 MPGe thread. You would be pretty high up on the list.

 

To get mileage on gas, you can use the display shown above to get the miles on gas, and divide by the gallons used. But the number shown for gals. is always purely rounded down. But you can get the exact value by just dividing your total miles by the MPG number shown on the other display. Of course, all this assumes you reset both displays on fillup. So if your miles in gas are 80, but your total miles are 150 and your MPG reads 100, then you have used 1.5 gals for those 80 miles. 80/1.5 = 53 for MPG on gas. And, by the way, this is roughly the MPG I get for my gas driving (summer).

 

It's not mine, I just nabbed that as an example from the top 20 mpge thread.

 

Here's an easier, perhaps more understandable answer. If you drive the PIP as a hybrid all the time, without plugging in, expect 49 - 52MPG overall - less if you have a heavy right foot. It's just a little worse than a regular Prius when driven like that because it's heavier. On the other hand, if you drive it only as a hybrid but keep the battery pack more or less charged, you will still get numbers that the regular Prius can't achieve even if you never use EV mode. That's because the extra battery capacity allows the car to run on the electric motors more of the time than a regular Prius, even when in normal hybrid (HV) mode, at least until you run out of extra charge. The best way to drive the car is to run the car in Hybrid (HV) mode on the highway and when climbing hills, and in EV mode when driving at low speeds and going down long grades. That kind of driving will give you, until the battery pack runs low, MPG numbers that used to belong to the "wishful thinking" category, or to mopeds. ;-)

 

I don't think that's true. Have any sources/numbers to back that up?

 

According to EPA it is the same (50 MPG combined) but not less.
According to my (short) experience it is about 10% higher then the regular. My first week with the PIP was without cable, so drove as a regular Prius, and compared to my previous 2010 Prius it was 10% better (same driving habits), but this was only short experience.

 

10% is a little optimistic I think. Myself and others have seen about a 2-3 MPG improvement, which would be closer to 5%.

 

I find the PIP more like 5-7 mpg better!

 

So you are saying at 60 mph you get 67 MPG?

 

I am saying that on my 4-6 90 mile trips a month I use to average around 53-55 with my 2010 traveling between 65-70 mph now with my PiP I'm averaging 60-63 same trip, sofar no winter travel so I expect it to go down aliittle.

 

Are you counting the PiP with a full charge in it? Or are you doing these trips with no charge?

 

Most of these trips are with full or partial charge to start, sometimes after 5 miles of 35 mph streets I get to the Parkway with little or no charge left, switch to HV reset trip B odometer. I realize with some charge left I am getting some battery boost.

 

Gotcha. I think without any charge in the PiP a 2-3 MPG is what is standard.

 

I was assuming the car would be driven by someone who didn't know how to drive a Prius for economy. If you take advantage of the extra capacity it will have even without charging, then you will get better economy. If you don't charge it and drive it like a regular ICE, I doubt it will do much if any better than a regular Prius because of the extra weight being accelerated, but I was just going by what I've read. It would be interesting to see what a PIP actually gets in real world driving, without being externally charged at all, driven by a 'Prius newbie'.

 

The advantage of the PiP (per the Toyota website) is that it is more efficient using the lithium battery than a regular Prius battery. That is where the advantage comes, not by the extra capacity.

It has been proven to get better FE than the regular Prius even with not plugging in or taking advantage of the extra battery size.