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#1
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AT has better MPG than MT?
I was checking out the MPG, and I noticed that for the 2005 Civic EX
Special Edition, the AT has better highway gas mileage than the MT (38 vs 37). I can understand them being the same, but how can AT be higher than MT? The AT even weighs 56 lbs more. http://automobiles.honda.com/models/...n&Category=ALL Is this just a deviation error in the EPA test? Is the EPA test a one-shot deal, or do they conduct it many times and take the best/average? Perhaps due to slight statistical deviation, maybe AT got 37.50 and MT got 37.49. Round it to the whole number and it looks like a big difference. |
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#2
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>>>>> Bucky writes:
b> I was checking out the MPG, and I noticed that for the 2005 Civic EX b> Special Edition, the AT has better highway gas mileage than the MT (38 b> vs 37). I can understand them being the same, but how can AT be higher b> than MT? The AT even weighs 56 lbs more. b> http://automobiles.honda.com/models/...n&Category=ALL Top gear ratio? http://www.hondanews.com/CatID2015?m...42203&mime=asc EX MT: 5th gear = 0.757, final drive = 4.41 EX AT: 4th gear = 0.638, final drive = 4.36 -- |
#3
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In article >, Guardsman > wrote:
> Top gear ratio? > >http://www.hondanews.com/CatID2015?m...42203&mime=asc > >EX MT: 5th gear = 0.757, final drive = 4.41 >EX AT: 4th gear = 0.638, final drive = 4.36 Looks like a good call to me. Guess with the torque multiplication of an auto, and the automatic kick-down, they feel they can get by with a taller ratio. And maybe an aggressive lockup control algorithm which will make the auto a lot more efficient than otherwise. Still seems unusual to best a manual on the EPA highway drive. |
#4
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Guardsman > wrote:
> Top gear ratio? > http://www.hondanews.com/CatID2015?m...42203&mime=asc > EX MT: 5th gear = 0.757, final drive = 4.41 > EX AT: 4th gear = 0.638, final drive = 4.36 And 15" wheels instead of 14". Taller overall? Lower city mileage, which would also fit with the "taller" idea. My Civic Hybrid has CVT, not a four speed AT, and I can believe that it is much more efficient at selecting engine speeds than I would be with a MT. -- --- Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5 |
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#7
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#8
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"TeGGeR." > wrote:
> wrote in : >> And 15" wheels instead of 14". Taller overall? > Unlikely. That would alter the ride height unless the suspension was made > differently, which it's surely not. Tire Diameter Tread Width 185/70R14 24.25 5.51 195/60R15 24.21 6.25 Right you are. -- --- Clarence A Dold - Hidden Valley (Lake County) CA USA 38.8,-122.5 |
#9
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how can AT be higher
> than MT? Yes, its in the gearing. My '96 Infiniti I30t automatic is rated for 28 highway. Less than 10% of those I30's were manuals, rated at 26 mpg. 4-speed Automatic: 0-60 8.2 sec 5-speed Manual: 0-60 7.5 sec There was a car back in the early '80's that even accelerated slightly better with a 3-speed auto than a 5-speed manual, a Ford compact I think. Tinkering with converter stall speeds and other auto tranny items can make them pretty effective competition. |
#10
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> >EX MT: 5th gear = 0.757, final drive = 4.41
> >EX AT: 4th gear = 0.638, final drive = 4.36 > Guess with the torque > multiplication of an auto, and the automatic kick-down, they feel > they can get by with a taller ratio. So the top gear ratios a MT = 0.757 x 4.41 = 3.34 AT = 0.638 x 4.36 = 2.78 Does this mean that if a MT is going at 3000 rpm, then the AT is only going at 2497 rpm??? I thought that AT ran at higher rpms at highway speeds (or was that a thing of the past)? |
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