Should I be worried ?

Explain this to the dealership you take your car to. It's still covered by warranty. Sure it's a hassle
but you do want it fixed don't you?

Who did the oil change? Is it related to your issue? Maybe.

You should change your profile information. Your vehicle is a 2015 not a 2012, right?

 

worrying won't fix it, action will.

 

We all want our new vehicle to be the one without the glitch or the problem.
And as hard as manufacturers try, it's still impossible to build all of them absolutely perfectly, all the time. Glitch Happens!.

Better that you discover it now, while still under warranty, than have this problem manifest 3 or more years from now.

As far as how would the dealership check this problem out?

I don't know if they would have a diagnostic that would directly test that gauge or reading....maybe.
But at the very least, if it's happening to you with common regularity, hopefully you could take it in, and have a tech ride along and reproduce the symptoms.

Disappointing when owning a new vehicle yes, but your best move at this point is to start the process of documentation of the problem and attempted repair and remedy.

Curious that it should manifest right after an oil change, and I'm far from an expert, but I can't imagine what with an Oil Change could possible affect that system. If they DO find a connection let us know, I'd like to know what it is.

 

i'm not sure i know what you're talking about.

 

is this true with any of the display modes? have you tried to go into the set up, turn off a mode then restart the mode and see if that effects it?

 

I did not mean to upset you. sorry

 

I very strongly suspect that what is happening is that you're simply seeing the results of having driven a longer distance. If I drive for one km at an average fuel consumption of 4.0 litres per 100km and then I drive the next one 1km at an average fuel consumption of 5.0l/100km, then at the end of the second kilometer the display will show 4.5l/100km.

But if I drive 100km at 4.0l/100km and then drive the next one km at 5.0l/100km, the display is still going to show 4.0l/100km because that last one km is such a small part of the overall distance. In other words, the fuel economy display doesn't show you the current fuel economy, it shows you the average since you started the car (or, if you're looking at the "Trip 1" or "Trip 2" display, since you reset the trip odometer). So the longer you drive, the less you'll see the fuel economy change because any immediate differences in driving conditions are so small compared to the length of the drive you've already completed.

If you want to see your "current" fuel economy then switch to the screen that shows the bar graphs of fuel economy at 5-minute intervals (last 5, 10, 15, 20, 25 and 30 minutes). The rightmost bar shows you the economy you're getting "right now" without any averaging.

 

Driving an American Prius C nothing is in km. But I know we have a choice of screens. Can you please explain which screen you are using? The Eco score, for example, the three bars measuring such and so out of 100, is something that I am intrigued by but fail to understand. It has no obvious bearing on mileage but does give a rating of the most economical use of the hybrid system versus the least economical use of it. Mine has whole numbers, like 40, 50, 85 and so on, as a ratio against 100. This is the most familiar thing. You are describing something that is next to the odometer. The odometer shows on numerous screens. Then there is the concept of whether or not it is feasible for you to go a distance for a paltry expense, yes it is. But the average referred to above seems the best answer. It is the 100 factor that confuses me in what you are saying.

For a realistic understanding get to know your choice of screens.

 

No, the technical explanation is the one that I'd be more inclined to understand/believe, instead of one that dumbs it down to be almost meaningless.

 

us americans are so confused...we use liters to describe the size of the engine, then we go about using miles and gallons for everything else about the vehicle, lol...we just don't know what system of measurement to use or stick to

 

I'm using the fuel economy reported at the very top of the screen - the part that doesn't change when you flip from one display to the next. Mine is a Canadian Prius so it reports fuel economy in litres used per 100km of travel which, as I understand it, is the standard way to do this everywhere other than America. In America this section of the screen shows "MPG" (miles per gallon).

I used litres/100km because that's what the Original Poster used, so my answer was intended to be understood by him. He was concerned because after driving around for a while he said his fuel economy figure got "stuck" on a number and wouldn't move. But I can state my response in MPG terms as well: If you drive for 100 miles and your display reads 50MPG, you shouldn't expect the MPG figure to change significantly over the next mile even if you drive that mile up a hill getting only 40MPG. The overall effect on fuel economy you get during that last mile is small compared to the economy you've been getting over the previous 100 miles. That's because the figure being displayed in that top part of the screen is an average since the car was started (or since you last reset the trip odometer, depending on which odometer you're looking at) and not a "current" figure. Because of that, the further you drive the less impact your current driving conditions will have on the average fuel economy being shown, until you reset it (either by stopping/starting the car or by resetting that trip odometer).

Nothing that I've discussed in this thread has anything to do with the "Eco Score". The standard way to measure fuel economy in Metric countries is to use litres per 100 kilometers - the "100 kilometers" is an arbitrary distance and has nothing to do with the maximum Eco Score. And my examples of driving 100km at one fuel economy and the next km at a different one (or 100miles and then 1 more mile) are again using an arbitrary distance and have nothing to do with the Eco Score.

 

Metric fuel consumption could be in km's per liter. But you know metric, gotta be different.

Liters per 100 kilometers is kinda like being on Jeopardy, everything backwards. After a while you get used to it, lol.

 

It's only logical if you're referring to fuel consumption, to express it in amount of fuel used per fixed distance.

Miles per gallon is a measure of how far you can go on a set amount of fuel. It is more a measure of fuel autonomy than fuel consumption. Makes sense?

 

Dborn is right - volume of fuel per some given distance gives you a number that reflects actual fuel consumption and as such is, IMHO, a more direct measure of fuel economy. A l/100km figure is more economical if it's lower, same as the price of some good or service. MPG is more of a "range" measurement - if you know how many gallons you've got it makes it easy to figure out how far you'll get before you run out of fuel.

But you're right - it's whatever you've grown accustomed to using.

 

Maybe that's why Americans like to push tanks, lol.

 

Much ado about nothing ...
It doesn't really matter. Quantity "X" provides exactly the same information as "1/X" , as long as you can comprehend the difference between multiplication and division.