Short trips are the big killer (same as with conventional power trains).
Cold weather means the warm-up time is extended, and short trips mean the
driving is mainly in warm-up mode. The rule of thumb is that a cold engine
will burn about twice the fuel of a warm one, and the Prius follows that
What size tyres do you have mounted on that Prius, and what brand?
And do they really still sell gasoline in the U.K. by the imperial
gallon and not by the liter, or I suppose you would spell it litre
or some modern French- or Continental-based measurement of volume?
2004-2007 UK tire
Bridgestone Turanza ER30
(Note the different size than the US!)
UK and Canada uses MPG using imperial gallons. Canada and most
everywhere else use l/100km. Japan still uses km/l.
That would go partway to explaining why a US Prius gets better mileage
than a UK Prius. Although I can't find the exact size, Turanza have
significantly higher rolling resistance than Goodyear Integrity tires.
Also the 195 versus 185 width increases aerodynamic drag.
For the sake of the experimental data, I have just been outside
to check my 2005 UK Prius: out in the dark dank chill with just
my feeble torch for company, as winds moaned and owls hooted...
Bridgestone Turanza. Couldn't make out the associated numbers.
But the tyres fit fine. :-)
I hope you lot appreciate that this effort was above and beyond
the call of any duty. Where do I apply for my medals?
BTW, why don't they fit Integras in this market? Mine was made
in *.jp, so they can't be any harder to find. Conflicting road
demands and/or national car type certification conditions?
We will award you the Parliamentary medal of freedom (all rubber).
The Turanza has better resistance to hydroplaning and longer tread life.
Here are the Consumer Reports ratings of it:
Braking - good
Cornering - poor
Emergency handling - good
With ABS - good
Hydroplaning - good
Snow traction - poor
Ice braking - poor
Steering feel - good
Impact - fair
Noise - fair
Rolling resistance - poor
Tread wear - very good
Okay, so long as it doesn't bounce. (OT: OTOH, if Parliament is
involved, some kind of dodginess seems likely.)
Hmm, yes. It does rain occasionally in the UK, more than in the
sunny parts of *.ca.us at least. And snow has been short lately.
Ta. I shall luxuriate in that low wear and loss of hydroplaning,
while maintaining the proper tyre pressures.
I was just out there too putting some more air into the Prius' tires (in
response to a RayO post that spurred me on), and saw that the Integras
were "Made in Japan", stamped right on the tire sidewall. If the car came
from Japan (which I believe they all do), they made a conscious choice to
fit yours with the Bridgestones instead of the Goodyears.
Barometric pressure and fuel quality can make either city or highway fuel
efficiency flip flop. On level ground doing 101 miles an hour my digital
display says real time fuel economy above 35 but less than 45 mpg. I
hesitate to believe a traditional non-hybrid would even come close to that
fuel economy range at that speed. So, when someone tells their husband they
only saw such and such fuel efficiency you can sure as hell bet they drove
much faster than what they said they did, or their range of speed was more
like an up and down 60 to 80. Can't place blame on the car.
The gain in highway efficiency is in the ability to use a lower output
engine due to the availability of supplemental power from the battery.
When operating at cruising speed, the engine will be running at a
higher % power level which is more efficient. In this mode, the
electrical drive line saves fuel by merely being there if you need it.
Not in three mile trips from a cold start on snowy streets, seldom exceeding
28 mph and sometimes with chains, I bet.
The weather has cleared and I'm into the 40s again (three mile trips and
The point where the petrol engine fires up depends on a mixture
of road speed and load being imposed. "Racing starts" are sure
to get it going at low speeds, in the Mk2 UK "T4" at least. If
just moving away gently from traffic lights (not a common thing
in the US has been my impression <g>), here in the UK I tend to
hit 10mph or so before the petrol engine joins the party.
Google for recent (Jan 2007) posts by me under the Subject 'More
on Prius "EV" mode'. Being all-electric is not the point of the
Prius. Being efficient in its use of fuel is. Huge difference.
Yes, except Honda update as another poster noted.
An after-market switch is available to make the current Prius operate
entirely on electric motors, like a Euro model. After Andrew's test
I thought it would not be worthwhile, but I'm having second thoughts.
Steven Scharf (SMS) posted this URL describing how:
ISTR more perspectives on this can be had by browsing around the
website priuschat.com -- mostly by folks who wanted to do it and
are mentioning odd details. In a UK Euro-Prius, the "EV" button
occupies the right-hand position of two switch holes to the left
of the steering column. If similar spaces exist in USian models
that would seem a good place to put the control. OTOH, a couple
of postings mentioned re-using controls on the steering wheel.
A good example of all electric performance that goes well beyond *very
modest* is when a Prius is *instructed* to back up an incline such as a
steep driveway. Mine has yet to revert back to engine power when the
accelerator is *pedal to the metal*.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.