Lexus Announces EPA-Estimate Fuel Ratings for All-New Lexus IS Luxury Sport Sedans

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09-16-05, 07:39 AM

#16

CK6Speed

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Quote:

Originally Posted by jrock65

It could be that we're entering an era where auto transmissions are getting so advanced that they're becoming more efficient than manual transmissions. The new Honda Civics, for example, get better mileage with auto than with manual (although not as big a difference as the IS250).

Civic 5-Speed Manual: 30/38
Civic 5-Speed Auto: 30/40

http://www.hondanews.com/CatID2011?m...38171&mime=asc

I believe it has more to do with the gearing than the trasmission. I do agree though auto trannies are much more efficient than before, but I bet if you look at the over drive 5th gear in the manual vs the automatics in question the autos 5th gear and final drive is taller than the manual. Auto trannies do have torque convertor lock ups, but until it does lock up it is still slipping and can't be as efficient as a fully engauged clutch.

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09-16-05, 11:52 AM

#17

spwolf

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Quote:

Originally Posted by CK6Speed

new auto's are actually very cool, not only they are more efficient than before, they even weight less than manual transmissions now. I know that in Prado, new 5 speed Auto is both faster and more economic than 6 speed manual.

In IS250, I think manual version is some 30lbs heavier...