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#1
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4AT vs. 5AT fuel efficient
Is a 5AT more fuel efficient than a 4AT, if we consider the same car?
If yes, in which road condition? The number of RPM on a 5AT is different (lower) than a 4AT for the same speed? Thanks, Chris |
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#2
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4AT vs. 5AT fuel efficient
What year and model are you talking about?
It really depends on other features of the engine and tranny and driving needs. www.fueleconomy.gov is a great resource for comparing fuel efficiency of different years and models, especially since individuals may now report their personal experiences with fuel efficiency. "Chris" > wrote > Is a 5AT more fuel efficient than a 4AT, if we consider > the same car? > If yes, in which road condition? > The number of RPM on a 5AT is different (lower) than a 4AT > for the same speed? > > Thanks, > Chris > |
#3
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4AT vs. 5AT fuel efficient
Thus spake "Chris" > :
>Is a 5AT more fuel efficient than a 4AT, if we consider the same car? >If yes, in which road condition? >The number of RPM on a 5AT is different (lower) than a 4AT for the same >speed? > >Thanks, >Chris > In general, maybe. Look at the final drive ratio for the two cars. The four speed may actually have a more fuel efficient top gear. The problem is that you'll give up performance for this. |
#4
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4AT vs. 5AT fuel efficient
Element 2004 - 4AT vs. Element 2005 - 5AT
"Elle" > wrote in message ... > What year and model are you talking about? > > It really depends on other features of the engine and tranny and driving > needs. > > www.fueleconomy.gov is a great resource for comparing fuel efficiency of > different years and models, especially since individuals may now report > their personal experiences with fuel efficiency. > > "Chris" > wrote >> Is a 5AT more fuel efficient than a 4AT, if we consider the same car? >> If yes, in which road condition? >> The number of RPM on a 5AT is different (lower) than a 4AT for the same >> speed? >> >> Thanks, >> Chris >> > > |
#5
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4AT vs. 5AT fuel efficient
On Wed, 05 Nov 2008 07:01:25 -0500, Chris wrote:
> Is a 5AT more fuel efficient than a 4AT, if we consider the same car? If > yes, in which road condition? > The number of RPM on a 5AT is different (lower) than a 4AT for the same > speed? > depends how well the ratios are matched to the power/torque curves of the engine. small differences in rpm's don't mean too much when it comes to cruising economy - you can have lower rpm's but higher gas consumption if the curves aren't a good match. |
#6
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4AT vs. 5AT fuel efficient
| >Is a 5AT more fuel efficient than a 4AT
mysterios deserve no info | In general, maybe. Often 5th / 6th gear is usable only on Germany's autobahn, & unusable in most countries unless user can ignore speed limits. |
#7
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4AT vs. 5AT fuel efficient
Thus spake "TE Chea" > :
>| >Is a 5AT more fuel efficient than a 4AT >mysterios deserve no info > >| In general, maybe. >Often 5th / 6th gear is usable only on Germany's autobahn, & >unusable in most countries unless user can ignore speed limits. > Incorrect. In my Fit, 5th lets me loaf along at around 3000 RPM and 65 mph. When I need to get around someone, it's usually because they've dropped my speed below 60. So I drop to 4th whle signalling and pulling out. |
#8
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4AT vs. 5AT fuel efficient
| 5th lets me loaf along at around 3000 RPM and 65 mph.
65 mph = 104.6 kph, @ this speed my SM4 ( final & 4th gear combined ratio = 3.132335, axle height 30 cm via 205/ 65R15 tyres, zero toe-in ) needs just 104.6 x 8750 ÷ 33 x 3.132335 ÷ 30 = 2895.8 rpm. Either your 5th gear's ratio is too high, or axle ( tyre ) height is low. | I drop to 4th whle signalling and pulling out. Sounds like a manual gearbox. Your gearbox is automatic ? |
#9
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4AT vs. 5AT fuel efficient
Thus spake "TE Chea" > :
>| 5th lets me loaf along at around 3000 RPM and 65 mph. >65 mph = 104.6 kph, @ this speed my SM4 ( final & 4th >gear combined ratio = 3.132335, axle height 30 cm via 205/ >65R15 tyres, zero toe-in ) needs just 104.6 x 8750 ÷ 33 x >3.132335 ÷ 30 = 2895.8 rpm. >Either your 5th gear's ratio is too high, or axle ( tyre ) height >is low. > >| I drop to 4th whle signalling and pulling out. >Sounds like a manual gearbox. Your gearbox is automatic ? > Manumatic. But my Civic was a manual and the same general effect applied. It's just that I can now stand on while shifting and signalling. |
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