Quote:
Originally Posted by jamesqf
This one? Toyota - Auris specifications Strange, but when I do it, I get (combined/urban/extra urban)
1.33L petrol - 5.9/7.2/5.1
1.8L hybrid - 4.0/4.0/4.0
1.4L Diesel - 4.5/5.4/3.9 |
Yep, the extra urban (i.e. highway) comparison seemed to be what you and Basjoos were discussing - the Diesel beats both, albeit not by much.
Quote:
Originally Posted by jamesqf
It looks like the diesel is a little bit better on the highway than the hybrid. But wait! We're not accounting for the fact that diesel has a higher energy content per gallon, are we? Taking the numbers off the Wikipedia page (and those are the lowest I saw), the ratio's 1.12:1. Adjust the figures, and we get 5.02/6.02/4.35, which makes the hybrid the energy efficiency champ.
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Sorry but I don't think this is valid. The extra energy content of Diesel is why less of it is used compared to petrol in the first place. By doing this you are counting it twice ?
Quote:
Originally Posted by jamesqf
But the real question is what you'd get if you took the petrol hybrid, and swapped in the diesel engine. I'd bet you'd see about the same improvement factor as between the petrol and hybrid, which is what I've been saying all along.
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Or of course just drop the weight in the Diesel one, add stop-start and have a car arguably more efficient again - worked example Ford Focus Econetic.
Urban - 62.7 mpg
Extra Urban - 83 mpg
Combined - 74 mpg
The Econetic without stop-start drops to 56 for the urban cycle, the extra urban stays the same which is what you might expect. The Prius official figures here are
Urban 72.4 mpg
Extra Urban 76.4 mpg
Combined 72.4 mpg
The Prius is ahead in urban, the econetic ahead in extra urban and the combined more or less equal.
Which is where we came in.
