Hybrid Car – More Fun with Less Gas

40 mpg Prius vs 50 mpg European Diesel cars - Page 8

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Posted by Ray O on May 3, 2006, 6:19 pm

I think the biggest drawback to a hybrid diesel is cost.  Both the diesel
powerplant and hybrid power plant cost more than a conventional gasoline
(etrol) engine so a diesel hybrid would have a double cost disadvantage to

Ray O
(correct punctuation to reply)

Posted by Martin Dixon on May 4, 2006, 4:23 pm

I would speculate that one problem with a diesel hybrid would be the
extra power needed to crank the engine, remembering that this will
happen quite frequently in a hybrid.  This may mean more batteries
(and hence weight) and a heavier engine anyway, meaning that the
engine will need to run more frequently than it would in a petrol
powered hybrid.

The hybrids that I have seen have clearly been designed to minimise
weight, even perhaps compromising braking and cornering performance by
fitting narrower tyres.  With present technology, it is even possible
that the extra weight required by a diesel engine would cancel out the
gain in fuel economy compared to a petrol engine.

The one thing that would really make hybrids irresistable would be a
means of charging the batteries from the mains.  That way, even less
fuel would be burned (at least by the car).  But I doubt the oil
companies would allow that to happen.

Created on the Iyonix PC - the world's fastest RISC OS computer.

Posted by Keith Willcocks on May 4, 2006, 4:30 pm

Does the hybrid engine actually stop and restart then?   I had always
assumed that it simply dropped to a tick over when not required.   Having to
restart each time must be horrendous.
Keith Willcocks
(If you can't laugh at life, it ain't worth living!)

Posted by Bill on May 4, 2006, 4:40 pm

Yep.  On rare occasions mine shudders slightly when shutting down but
otherwise it's not noticeable.  A common hybrid experience is sitting at a
light listening to the folks around you wasting fuel for no good reason.   I
corrected the subject line.

Posted by Keith Willcocks on May 4, 2006, 5:24 pm

Actually, my Peugeot 406 HDI diesel (the common rail engine) averages 46mpg
.   This means that, to average 46, it must at times exceed 50 to counteract
higher consumption in traffic.   Bear in mind though that these averages are
using the Imperial gallon, not the smaller US one.    Factoring the US
gallon into my spreadsheet shows an average of 35mpg(US).   I assume that
the figures quoted for the hybrid are US, not Imperial?
Keith Willcocks
(If you can't laugh at life, it ain't worth living!)

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