petrol use versus battery ratio

have you looked through the manual? i think n/a cars have a screen somewhere

 

My electronic user manual page 111 "Drive monitor". You use trip button to scroll between different trip displays and ODO.

 

How many miles on the odometer? Have any or both of the trip meters been reset? And has the odometers mpg gauge been reset? If the car still has one trip meter that has only been through it's 10k miles auto reset or the odometers mpg gauge has not been reset, either mistakenly or for some other reason. There is a screen on the MID ((multi informational display ) that shows EV% for both trip meters and the odometer.

After putting the car in ready mode hit the down arrow on the right side steering wheel ring twice and look at the screen. Than hit the trip button of the left hand side of the steering wheel to see the EV% for the trip meters.

 

You can’t. That is because, unfortunately, the car does not store the information about the plug-in energy.

You need to estimate it using the kWh you used. For example, if you average 30 mi per full charge, estimate how many full charges you had. You can then correct the mpg shown on the odometer by subtracting the plug-in miles corresponding to your full charges.

There is another complication. The odometer estimates the mpg by 5 mpg, which you should subtract.

Since you are in Ireland, you may be using ℓ/100 km for the fuel-economy unit.

For example, my odometer mpg is 84.8 mpg. This corresponds to an actual mpg of 79.8 mpg. However, this also includes the plug-in miles. When I estimate and subtract the plug-in miles, I get about 70 mpg, perhaps a little below like 67 mpg, for the HEV-only (non-plug-in) mileage.

 

As long as you NEVER reset the Odometer trip information it'll give an accurate depiction of percentage driven on battery. In my case its 61%.

 

As far as I understand, that (miles with the engine off) is not what the OP is asking. The OP is asking if there is a simple way of knowing the plug-in miles. The answer is no.

Get a watt–hour meter, which will record your electricity usage. You can then estimate the plug-in miles by assuming some average for miles per kWh.

 

What's that mean to you? knowing the pluigin miles, actual miles or percentage of miles driven in EV mode?
If actual miles than sure, but do you really think your description is how to estimate actual miles driven in EV mode is a simpler way than converting the percentage of EV usage per actual combined miles driven?
Or are you looking to calculate a closer estimate of actual EV miles driven and exactly how to log it, because the car doesn't have a gauge to show it that way.

 

OK, I am saying that the OP is interested in the BEV miles, not the HEV miles. For example, a Prius HEV will have roughly 60% HEV miles; however, it will have 0% BEV miles, as it does not have a plug/charger.

For the Prius PHEV (PHEV being short for HEV & BEV), you can get the combined HEV and BEV miles on the car’s display, but you cannot separate them. A person who has never used the ICE will have 100% BEV miles and 0% HEV miles—shown as 100% EV miles on the display. A person who has never used the plug/charger will have, say, 60% EV miles shown on the display, 0% of it being BEV miles and 60% of it being HEV miles. So, in general, you wouldn’t know how much the car was driven on the plug or on gasoline by simply looking at the display.

That is why I suggested to get a watt–hour meter for your plug—it is like keeping gas-station receipts. That way, you will have an idea of both your BEV and HEV miles. In a PHEV, it is impossible to perfectly separate the BEV and HEV miles—as you always need to make assumptions—however, with good assumptions, you can get a good approximation on both your BEV and HEV miles if you know both your electricity and gasoline consumption.

 

I guess you've never seen the Drive Monitor 2 screens, up 4, or down 2, screens from the MID's default screen.

Sorry, ya lost me, or perhaps I'm just to lazy to try reading between your lines to find a deeper meaning than shows in the dialog.

 

So, where is the BEV miles (not the HEV miles) on the drive monitor 1/2, which is what the OP is asking for?

The drive monitor 2 only shows the average BEV mi/kWh (kWh at the battery, not at the plug). It does not show the BEV miles or the BEV kWh. It only shows their ratio. That is why I am saying that you need a watt–hour meter to measure the BEV kWh (at the plug) and estimate the BEV miles from that. You can use the BEV mi/kWh (at the battery) on the drive monitor 2 in that estimation if you like. You need to reduce the mi/kWh at the battery by about 10% (or perhaps by 5%) to account for the efficiency of the charger though.

 

Dang, what are you trying to say? It doesn't show BEV miles? Sounds to me like you want argue semantics about how a gauge only shows a perentage of a not reset ODO, Trip 1, and / or Trip 2 miles, scrolled through on Drive Monitor 2, driven in EV mode and not an actual mile count for you to write down straight off the gauge, as I mentioned previously.
Than offering your solution in a convoluted combination of of percentage of kWh from the wall and some other bizarre mathematical gymnastics to dial in the (REAL) number. Good luck with that, I hope you find others to backup your math.
And just so everyone knows when Trip A and Trip B reset themselves after 10K miles ( when not reset manually ) Drive monitor 2 's EV percentage for each of those gauges stays intact. I can't say for sure what happens to Drive Monitor 2 EV percentage when Trip A or Trip B mpg and miles driven reading is reset manually.
This is my last post in response to your arguments. just so you don't expect me to continue this conversation. OK?

 

That is because you have not been listening to what I have been politely saying.

I have just verified this for good by checking my EV-driving ratio (after reset) shown on the display. It is 57%. I know that my plug-in (EV mode) driving ratio is only about 15%, as I plug in only once a week and drive about 10,000 miles a year. Therefore, the EV-driving ratio shown on the display includes not only the EV mode but also the HEV mode. It is no different than for the non-plug-in Prius. The non-plug-in Prius owners also see an EV-driving ratio of around 50%, despite their plug-in driving ratio actually being 0%—as they have no plug. The EV-driving ratio is basically the ratio of the miles with the internal-combustion engine off to the total miles, and even for the non-plug-in Prius, it is around 50%, as even for a non-plug-in hybrid, the engine is off for about half the time while driving and accumulating miles.

The OP has been asking for the exclusively plug-in driving ratio, not the EV-driving ratio combined both in the HEV and EV modes. So, the only way to estimate the former is to get a watt–hour meter. The car only shows the EV-driving ratio combined both in the HEV and EV modes.

 

Here is how this works. The first screenshot is for pure HEV driving in a single trip (after start); so, you would expect that the EV-driving ratio would be 0% if it were measuring the plug-in miles. Actually, there was some SOC drop; so, perhaps it would be about 10% if it were measuring the plug-in miles. However, it is 52%, clearly indicating that it does not measure the plug-in miles but simply measures the miles with the engine off—same as in the non-plug-in Prius. By the way, you can see how impressive my mpg number for that single trip is, which was mostly freeway driving.



The second screenshot is the lifetime EV-driving ratio (after reset). I know that my plug-in driving ratio is about 15% at most. However, it is showing 57%; therefore, it is the same ratio as in the non-plug-in Prius, which shows the ratio of the miles with the engine off to the total miles, not the ratio of the plug-in miles.



The long story short, you cannot obtain the information the OP is asking for, which is the ratio of the plug-in miles to the total miles, anywhere on the car’s information display. The only way to obtain an estimate is to use a watt–hour meter.

If you still think that the EV-driving ratio is measuring the plug-in miles, simply make a single HEV trip and look at the display for the EV-driving ratio after start while you drive. You will easily see what I mean.