mpg numbers are shown on website for 2016 Prius

So we still don't know if the measurements were done with the 2015 regs or the 2016 regs?

I note that the article mentions winter mileage will suffer a lot, but we all know from Toyota's info. that the fourth gen. will suffer less, as it has better exhaust heat recovery and other enhancements that should improve mileage in winter. If I say it maybe it will come true?

Sounds like the previously released mileage figures were what they submitted, but couldn't call official until the EPA put their stamp on it.

Also sounds like Toyota are slightly disappointed the mileage wasn't better, but don't want to talk about that.
I suspect it's just a reflection of all the work that went into the GIII. Very hard to beat good work! They did, just not by as much as they'd hoped!

 

So, Gen III - 50mpg combined; Gen IV - 52mpg combined = 4%!

 

If it's better in the cold weather (per your hopes) it should also be quicker to heat up, so the observed MPG over Gen3 might be good (on Fuelly for example). It's almost like the eco model is showing us the MPG potential.

 

^^^
Plus 28% more regen and engine off at higher mph

 

Hybrid Cars article states winter MPG is low due to cold HV battery!?

I do not think we have ever included "cold battery" on our list of reasons for lower winter MPG in a Prius. Interesting comment, but I feel they have probably read-across from Plug_ins (with larger batts) to Prius.

 

Yes Prius is not up on fueleconomy.gov yet.

MERGED:

where is this from, do you have a link?

 

My interpretation of pages 13 & 16: 2016 Prius Hybrid Vehicle Engineering, by Sunsuke Fushiki - Google Drive

 

I just checked: Test Car List Data Files | Cars and Light Trucks | US EPA

The 2016 file does not include the new Prius, yet.

Bob Wilson

 

The fuel economy of the gen. 3 Prius was 3,9 Liters in Europe and 50 mpg in the US,so there was a difference of about 0,7 liters .
The new gen. 4 Prius is rated at 3.0 liters in Europe,so considering it will have the same difference that would mean about 3.7 liters or 63.5 mpg for US rating !
The gen. 4 Prius should be ratet well over 60 mpg I the US !
BTW we don't even get the Eco-Version !

 

European and US tests do not test the same speeds, accelerations, or warm up parameters, so they do not compare well. (Nor do the Japanese tests) Toyota has been careful NOT to use one test to guess the results of another.

 

I am aware of this,and did say there is a difference of 0.7 liters between the cycle in Europe and the US ,so if we are ratet at 3.0 for gen. 4 using the European test cycle,that means you would be rated at 3,7 liters or 63.5 mpg if we would use the current US cycle in Europe !

 

Gen III mpg on this new test? It's not like there's no 2015 available to test.

 

that would be nice to know, and give us the true mpg increase percentage.

 

So, only an increase of 2mpg combined after all the work that went into Gen IV?

 

It seems to be hard to improve on perfection.

 

A cold battery is lower to charge and discharge, and will be less efficient during startup in the winter.

I once looked into 12 volt electric blankets for preheating my gen2's pack.

The Prius is still a gasoline only car. Toyota has done when with the thermal efficiency of the ICE, but we are likely hitting the limits of spark ignition engines without paying high costs.

I expect the gen4 to return better user fuel efficiency overall with the other improvements they added, but more big jumps as we saw in the past will likely require a plug.

 

Issue is that EU and JC08 are mostly equivalent of EPA city rating, so 20% improvement on EU not equal 20% on EPA.

Similarly JC08 gives much better improvement than 4% increase we see on EPA.

I am regularly 8-9MPG above EPA, but I could see the merits of them rating it as low. My better half manages to get 5-7MPG worse and she is a slower and less aggressive driver. It is a puzzle for me how that happens.

At least until Mazda releases SkyActiv2 with HCCI and 50% thermal efficiency.