Honda Car Forum

#1 (**permalink**) 05 Nov 2008, 07:01 am

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

#2 (**permalink**) 05 Nov 2008, 09:40 am

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" <criro1999@gmail.com> 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 (**permalink**) 05 Nov 2008, 07:50 pm

Thus spake "Chris" <criro1999@gmail.com> :

>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 (**permalink**) 06 Nov 2008, 12:28 pm

Element 2004 - 4AT vs. Element 2005 - 5AT

"Elle" <honda.lioness@gmail.com> wrote in message
news:UfiQk.7$KK3.2@newsfe01.iad...
> 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" <criro1999@gmail.com> 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 (**permalink**) 07 Nov 2008, 08:38 pm

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 (**permalink**) 13 Nov 2008, 07:53 am

| >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 (**permalink**) 13 Nov 2008, 10:17 pm

Thus spake "TE Chea" <4ws@gmail.com> :

>| >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 (**permalink**) 14 Nov 2008, 01:13 am

| 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 (**permalink**) 16 Nov 2008, 12:10 am

Thus spake "TE Chea" <4ws@gmail.com> :

>| 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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