Perfect shift points to get the best gas milage?
#5
02-25-2008, 05:03 AM
try and search around a bit to get some idea, as many have posted on
similar things. You will most likely find more info that way.
I have recieved 34.5 city from just about all 1800-2500 shifts and skip shifting
and I have recieved about 28-29mpg hauling a$$ with mostly over, as in a bunch over 3k.
but my car is still relatively new...so...
check out ppl with scangauges and that should help out... even if it partially conflicts its still better than blindly guessing.
good luck on this never ending quest
similar things. You will most likely find more info that way.
I have recieved 34.5 city from just about all 1800-2500 shifts and skip shifting
and I have recieved about 28-29mpg hauling a$$ with mostly over, as in a bunch over 3k.
but my car is still relatively new...so...
check out ppl with scangauges and that should help out... even if it partially conflicts its still better than blindly guessing.
good luck on this never ending quest
#6
02-25-2008, 04:33 PM
The answer is the lowest rpm that shifting up will not 'lug' the engine, that is, cause the engine to run roughly. That minimum rpm depends on the road grade, weight in your car, and gasoline you're using. And that's not all.
You will get better mpg by manually shifting the sport automatic as the computer program is not good as you should be. If you're driving a manual same rules.
PS thats the procedures used effectively by theMobil gas economy run winners.
You will get better mpg by manually shifting the sport automatic as the computer program is not good as you should be. If you're driving a manual same rules.
PS thats the procedures used effectively by theMobil gas economy run winners.
Last edited by mahout; 02-26-2008 at 10:18 PM.
#7
02-25-2008, 07:37 PM
You must live where there is no hills. To get to my house you have to go up a rather large hill with a speed limit of 40mph so in order to get up it im well over 3k every time.
Tyler
Tyler
#8
02-25-2008, 08:38 PM
nah not really. I live in the mountains, but on the highway, city driving etc.
#10
02-25-2008, 10:28 PM
Hi guys, thanks for the reply's. I am getting 348.7 miles on my 2nd tank and the tank was almost empty when I filled it up. When I filled up, I paid $28 which is very desirable and that is for $3.099/gallon on regular gas. I put 9.034 gallon to get the tank full. So if my computation is right, that should be 348.7 ÷ 9.034 = 38.59 or 38.6mpg. Someone correct me if I am wrong. I achieve that number and my Fit is not even broken in and I was driving it more than I should be driving it. I am very satisfied.
#11
02-25-2008, 10:32 PM
what percent is highway and city?^^
also where have you been shifting? I am not getting as good gas milage, but also I theres snow on the ground and its been cold- cold air = denser air, more air into the engine = more power, mmore gas comsumption
also where have you been shifting? I am not getting as good gas milage, but also I theres snow on the ground and its been cold- cold air = denser air, more air into the engine = more power, mmore gas comsumption
#12
02-25-2008, 10:33 PM
3k rpm
If you're talking about skipping gears, such as going from 2nd to 4th instead of 3rd, I wouldn't suggest it. Honda has put out a service bulletin about this resulting in customer complaints of poor shift quality. **The bulletin applies to manual transmission cars.
I normally shift right at 3000 rpm and I regularly see 40-42mpg mixed driving in the winter and 46-48mpg mixed driving in the summer. Thats with a MT though.
I normally shift right at 3000 rpm and I regularly see 40-42mpg mixed driving in the winter and 46-48mpg mixed driving in the summer. Thats with a MT though.
#13
02-25-2008, 10:43 PM
Edit: I was shifting when I first took it of the lot around 4k-5k rpm and while on the highway on the way home(about 80-90 miles away) I was constantly changing at 65-70mph, then I went back to the dealership and did the same style of driving the following day
Last edited by Black01; 02-25-2008 at 10:47 PM.
#14
02-25-2008, 10:44 PM
i try to shift below 3k, but having driven an s2k for the past couple years, i cannot help but rev up to 4k every time i shift... i have a bad habit of it.. and vtecing it everywhere i go.
but i still get 30mpg easy with this kind of driving.
but i still get 30mpg easy with this kind of driving.
#15
02-26-2008, 03:27 AM
going from 1-3-5
1-2-4-5
2-4-5...
depending on the transmission
2-4-6
and 1-2-4-6
^^^those are all common ones
you get the gist...
many times its just a waste to go through each of the gears, like on easy down grades, or slow and steady cruising. And by and large it gets you in a higher gear longer so you can keep a lower RPM longer.
1-2-4-5
2-4-5...
depending on the transmission
2-4-6
and 1-2-4-6
^^^those are all common ones
you get the gist...
many times its just a waste to go through each of the gears, like on easy down grades, or slow and steady cruising. And by and large it gets you in a higher gear longer so you can keep a lower RPM longer.
#16
02-26-2008, 03:32 AM
If you're talking about skipping gears, such as going from 2nd to 4th instead of 3rd, I wouldn't suggest it. Honda has put out a service bulletin about this resulting in customer complaints of poor shift quality. **The bulletin applies to manual transmission cars.
I normally shift right at 3000 rpm and I regularly see 40-42mpg mixed driving in the winter and 46-48mpg mixed driving in the summer. Thats with a MT though.
I normally shift right at 3000 rpm and I regularly see 40-42mpg mixed driving in the winter and 46-48mpg mixed driving in the summer. Thats with a MT though.
Poor shift quality, like they wore out the clutch? Or it just wasnt as easy?
Can you point me in the right direction with regards to the bulletin? I would be interested to find out whats different about the Fit. As this is the last car I would want to mess with, I dont want to add to the list of issues I think I am experiencing already.
#17
02-26-2008, 12:29 PM
Service News
This is from the January 2006 Honda ServiceNews:
"Skip Shifting Is Brutal on
Synchronizers
Synchronizers
Gear ratios in 6-speed manual trannies are spaced
close together so you can keep the engine speed
in its optimum range for max power and
acceleration. Shifting to the next higher or lower
gear in a close-ratio tranny causes small changes
in engine speed.
Shifting a close-ratio tranny through its gears by
the numbers puts a very small load on the
synchronizers since they only have to make small
changes to the speed of the mainshaft and the
clutch disc.
Some drivers, though, like to skip shift so they
don’t have to work the clutch pedal and shift lever
as much. They like to accelerate in 1st gear, then
pop it into 3rd gear, then into 5th or 6th. Skip
shifting, though, is really brutal on synchronizers;
it puts a higher demand on them than they were
designed to take. Skip shifting can cause
premature synchronizer wear that can cause the
gears to grind when you shift up or down.
If you’ve got a vehicle in your shop for repeated
damage to the synchronizers, go for a test-drive
with your service customer to see if he or she is
guilty of skip shifting. If that’s the case, remind
him or her skip shifting can be an expensive habit
to break. Any repairs due to skip shifting may be
reviewed and debited by your DPSM."
I realize this says it's for the 6MT's, but I still try not to make a habit of skip shifting. I believe this applies to the majority of Honda's MT's, but people with 6MT's are probably more likely to skip a gear or two when accelerating to highway speeds. Sorry I can't get a screenshot of the 'ServiceNews' right now.
close together so you can keep the engine speed
in its optimum range for max power and
acceleration. Shifting to the next higher or lower
gear in a close-ratio tranny causes small changes
in engine speed.
Shifting a close-ratio tranny through its gears by
the numbers puts a very small load on the
synchronizers since they only have to make small
changes to the speed of the mainshaft and the
clutch disc.
Some drivers, though, like to skip shift so they
don’t have to work the clutch pedal and shift lever
as much. They like to accelerate in 1st gear, then
pop it into 3rd gear, then into 5th or 6th. Skip
shifting, though, is really brutal on synchronizers;
it puts a higher demand on them than they were
designed to take. Skip shifting can cause
premature synchronizer wear that can cause the
gears to grind when you shift up or down.
If you’ve got a vehicle in your shop for repeated
damage to the synchronizers, go for a test-drive
with your service customer to see if he or she is
guilty of skip shifting. If that’s the case, remind
him or her skip shifting can be an expensive habit
to break. Any repairs due to skip shifting may be
reviewed and debited by your DPSM."
I realize this says it's for the 6MT's, but I still try not to make a habit of skip shifting. I believe this applies to the majority of Honda's MT's, but people with 6MT's are probably more likely to skip a gear or two when accelerating to highway speeds. Sorry I can't get a screenshot of the 'ServiceNews' right now.
#18
02-26-2008, 04:15 PM
It also mentioned close ratio (which I thought would be easier and even less effort to skip shift, but we deffinately dont have a close ratio box)
It is particulary brutal when improper rev matching is employed. But its not usually used (properly if there is such a thing ) just for acceleration out right but more constant speeds and slow transitions, as well as on light down grades.
Thanks for the post though, I will definately not increase it, but I hardly see what im doing or have done to be a significant prob.
But I will look into it further, I also remember something about a high shift frequency being hard on synchros (like shifting up through the gears very quickly and not drawing them out, not being in the power band like ever for the gears.)
If you get more info please send it down. Thanks
It is particulary brutal when improper rev matching is employed. But its not usually used (properly if there is such a thing
) just for acceleration out right but more constant speeds and slow transitions, as well as on light down grades.Thanks for the post though, I will definately not increase it, but I hardly see what im doing or have done to be a significant prob.
But I will look into it further, I also remember something about a high shift frequency being hard on synchros (like shifting up through the gears very quickly and not drawing them out, not being in the power band like ever for the gears.)
If you get more info please send it down. Thanks
#19
02-26-2008, 08:16 PM
I just did a pretty hard tank. All city, shifts at or around 4k or higher and got 27 in my AT. This tank im going to feather the throttle and drive like a grandma and see if theres a big diffrence.
Tyler
Tyler
#20
02-26-2008, 08:20 PM
Manual 08 sport
65 is pretty much the optimal speed for highway speed, maybe a little bit slower if possible, but if your pulling about 40 mpg thats really good.
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