Possible undiscovered performance and MPG issues with Prius v (lowercase v)

I spent a lot of time on the brakes leaving them my special attention. I did the work surface temperature measurements and compare data. At the end, I disabled all 4 high pressure line and manually pushed the pistons in. Parking brake shoes removed completely. All that did not help but like version had been checked and validated. Later, I rebuild all 4 calipers on my Prius.
Most likely I won’t be able to have a chance in the near future to compare the Prius (trailer vs. normal) since I have no more orders to purchase these cars overseas due to the very high dollar value :-(

 

I did the alignment twice. The alignment technician runs away when he sees me, as he's tired of me and my requests I'm writing here on Prius Chat as I hope to find somebody local (in L.A. area) who could help me to run more tests...Like roll-out test for example. In the future course.
I'm really loosing my mind trying to solve this puzzle... after each drive I'm running around the car with IR thermometer and measuring the brakes temperature, wheel bearings temperature...
My car feels like it has a small trailer attached. It's hard for the car to drive... but at the same time it rolls seemingly OK in neutral. There is some kind of contradiction in this.
Here is the main problem again: it feels like MG2 struggles and fails to keep the car rolling at constant speed without the ICE. Some Prius wagon that I tested had no problem keeping say 35-40 mph or so in city traffic with ICE shut down (is it called "glide" ?) . It's this mode that allows Prius to get the outstanding city gas mileage. My Prius though (and some other ones that I test-drove, that feel like they have a "trailer" attached) struggle to keep the speed on battery alone.
I have checked and re-checked every possible reason many times; the Hybrid System turns the ICE off and tries to drive using MG2 only, but is unable to keep up and either the speed decreases, or computer turns the ICE back on. This is I think where the problem is. I have seen at least 3-4 Prius wagon with the same puzzle plus the one I own today.
The engine on my Prius wagon is not fresh but works well. New intake (last generation), EGR clean 100%, I have not tested the injectors yet but will check soon. OEM 17 rims and all 4 new 215/50ZR17 Continental ExtremeContact DW Max Performance Summer Tire's (51psi max, only 21lbs and 818 RPM)

 

Thank you for your comments. I am very busy this weekend and I won't be able to respond until Monday but i will definitely has something to say about it.

 

Thank you very much for all your comments and answers. I am glad to comment on them.
Chazz8
Yes, I have installed not a LRR but as I mentioned before I did try to install LRR from the good running Prius wagon. But didn’t get the same performance. And didn’t feel any difference. LOL, Not to mention that I do believe in a magic performance of tires with LRR but only if you using them for long period of time and with the speeds higher than the city speed. Before 40 mph it’s a barely minimum difference, I somewhere agree that this is the a good suggestion but not really in my case.
Chazz8 did write what I expected to get from some of you. He summarized what we are discussing here. Yes, this is the ‘Trailer’. Good Prius wagon running in the city on EV very steady and consistent. 16 or 17 rims all the same. We should be asking questions to those who has a Prius wagon in the range of 45-50 mpg. They are driving in the city without any difficulties on EV. But “trailer” won’t do this no matter what you do. YES, if you can drive very carefully you probably may get 42MPG. And I did it myself. But again, ask people with the good Prius wagon if they try and even think about mpg while they are driving? No, Prius wagon with good performance let you drive, enjoy the car and get very high mpg. Not to mention, that I didn’t find the car in the middle. It either ‘trailer’ or a good Prius v (lowercase v for the prius v wagon) wagon.

mikefocke
Thank you for your comment about ‘mud guards’. Of course they impact the mpg but not on speeds below 40 (the ones we are discussing here). And again their impact is fairly low. One more time about tires. I have a regular disk size (17) and tires. I increased tire pressure to maximum of 53 psi. But it didn’t do anything. On the other hand, one of the good Prius purchased by me with the same disc size 17 and OEM tire pressure 33 front and 32 rear drove amazing on EV and gave me 45-50 mpg.

Don’t forget that we are driving Prius station wagon, heavier/bigger than a hatchback. The usual difference is ~8 to 10 MPG. I hope you are comparing v to v and not v to expected from hatchback MPGs. I think your expectation of 45 from a v with "normal" driving is overly optimistic. Go over to fuelly and, understanding that those who post are probably the ones most likely to be very mileage conscious and using some hybrid driving techniques. See what real people are getting. 70mph Prius v's average 42 MPG. There are some few who report similar mpg, one I note was saying 5% city use. If he spent all his time at 75MPH plus ....

Prius v (lowercase v for the prius v wagon) wagon is sharing 100% same engine with basic Prius. Yes. But transmission is different. MG1 and MG2 the same. Good Prius wagon can also drive perfectly as a basic Prius. By using different gear ratio engineers reached similar performance in terms of speed and starting but of course lost some mpg. I am comparing just a wagons and I know what I am talking about. Look again at the photo the one posted with my first post. There are 48.8 mpg for the good Prius if the car was not too much driven on freeways and this is normal! This was an average for 2,533 miles!

Anyway, I have received what I was asking for. I understood that some of you just drive and think that this is how Prius should perform. With the tons of difficulties and headaches if you are getting just about 40-42 or less mpg in the city then YOU ARE driving a ‘trailer’

I will continue to try finding reasons and causes. And if I find and I can assure that i well since I am planning to buy another good Prius. Then I will definitely share it and let you know the secret.

Good luck to all of you!