OK TOYOTA, Now give us our diesel hybrid.

PS, do you understand (yet) that the '117 mpg' number is blended, meaning energy from the grid + petrol ?
That we do not know the fractions of each ?

 

I believe his point was that the Prius PHV gets more miles per gallon, even with smaller gallons.

Tom

 

Umh, yeah I know. . . I mean. . . I knew that, just checking you guys, making sure your paying attention!

 

I was just giving an educated guess on what the hypothetical Volt's diesel mpg would be, and not trying to compare it to gas mpg. Since the 50mpg is for the gasser Volvo, the calculations are wrong anyway.

EV performance can't be used to infer ICE efficiency because it relies on a bunch of assumptions. Mainly that the ICE and motor same level of efficiency, and that both modes follow the same mechanical path, and losses, to the wheels. For a pure serial hybrids, where the ICE is just a generator, the inference can work. Since neither are, it isn't going to work. In the Volvo, the modes don't even drive the same set of wheels. Just changing the battery chemistry in the 2013 Volt increased EV mpge to 98. If it was used for the inference, it's ICE would be 7% less than the Volvo's. Yet it has no change to to CS fuel economy.

 

Not to mention (again) that it is European testing, and that EPA would be around 50 mpg.

 

Read more: http://priuschat.com/threads/ok-toyota-now-give-us-our-diesel-hybrid.110913/page-9#ixzz1yooHLJ4r​

True, my mistake.​

 

No one said they were anything else. You then quote them even more extensively while complaining about others simply referencing them was the amusing observation.

As to it being fluff, it is the government ratings for a production vehicle on sale now in Europe so a bit more than "fluff". It's a car on the road for sale to general public.

 

STUDY: Switching To Natural Gas Adds $26 Billion To The US Economy - Business Insider

 

There are also different design considerations behind diesels/gassers when it comes to FE. At a given load, the difference in BSFC between a VW TDI and TFSI engine is ~10-15% in something like an A3/Jetta/etc, while the difference in FE is about 30%.The other 15% comes from different transmissions with gear ratios optimized for fuel efficiency as opposed to acceleration. I wouldn't be surprised if someone dropped the DSG from a TDI into a TFSI vehicle and managed to get ~28-30mpg combined.

 

Very good point. We see the same trade-offs in the hybrid space too. Looking at you, Honda