2005 Pontiac Wave: New Fuel Economy Record

yeah, so if you can do it, give it a whirl and you should get higher numbers.

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Originally Posted by thebluelightbulb

you might hit 40 at 100km/h, but most of my highway driving is on a 80km/h limited road. the OD on my auto shifts in at about 73km/h and i can wind it down to 71 (it kicks out at 70). i find that i get my best economy at around these speeds. i usually drive between 75 and 85, as to not *completely* tick anyone off. using the expressway kills my FE, especially when i get a head-wind on most days.

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Our Aveos do not have 'overdrive'. It's a 4-speed automatic.

But you are correct about it going not goijng into fourth gear until about 73 kmh (or 43 MPH). That's far too late for a 4-speed.

You can read more about it in the ongoing discussion under 'fuel economy'.

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Originally Posted by Thymeclock

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Originally Posted by thebluelightbulb

you might hit 40 at 100km/h, but most of my highway driving is on a 80km/h limited road. the OD on my auto shifts in at about 73km/h and i can wind it down to 71 (it kicks out at 70). i find that i get my best economy at around these speeds. i usually drive between 75 and 85, as to not *completely* tick anyone off. using the expressway kills my FE, especially when i get a head-wind on most days.

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Our Aveos do not have 'overdrive'. It's a 4-speed automatic.

But you are correct about it going not goijng into fourth gear until about 73 kmh (or 43 MPH). That's far too late for a 4-speed.

You can read more about it in the ongoing discussion under 'fuel economy'.

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Actually, from doing some research, people are stating it is a 4 speed WITH torque convertor lockup.

http://townhall.edmunds.com/direct/view/.f0f60f9/0

Fourth gear ratio on the automatic is 0.7, that is an overdrive gear.

http://gm.ws123.net/EN/documents_200...en.html#T5A0GS

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Originally Posted by ontarian_frog

Fourth gear ratio on the automatic is 0.7, that is an overdrive gear.

http://gm.ws123.net/EN/documents_200...en.html#T5A0GS

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That's odd. Some people are claiming to feel four gears and then monitor and see the torque convertor lockup on the highway.

Torque convertor lockup isn't always stated as a gear seeing it isn't truly a gear.

But I could be wrong.

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Originally Posted by NorthernAveo

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Originally Posted by ontarian_frog

Fourth gear ratio on the automatic is 0.7, that is an overdrive gear.

http://gm.ws123.net/EN/documents_200...en.html#T5A0GS

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That's odd. Some people are claiming to feel four gears and then monitor and see the torque convertor lockup on the highway.

Torque convertor lockup isn't always stated as a gear seeing it isn't truly a gear.

But I could be wrong.

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that's probably what OD really is on the aveo, just a torque lock-up in 4th. if OD was an actual gear, it would have been advertised as a 5-speed auto.

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Originally Posted by thebluelightbulb

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Originally Posted by NorthernAveo

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Originally Posted by ontarian_frog

Fourth gear ratio on the automatic is 0.7, that is an overdrive gear.

http://gm.ws123.net/EN/documents_200...en.html#T5A0GS

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That's odd. Some people are claiming to feel four gears and then monitor and see the torque convertor lockup on the highway.

Torque convertor lockup isn't always stated as a gear seeing it isn't truly a gear.

But I could be wrong.

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that's probably what OD really is on the aveo, just a torque lock-up in 4th. if OD was an actual gear, it would have been advertised as a 5-speed auto.

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Not really. I don't know of one car being sold right now in America that doesn't have overdrive. Advertising a car with overdrive is pretty useless these days. 4 speeds is what it is: 4 gears. If the torque converter would never lock up, you could expect very low transmission life and much poorer gas mileage.

Here is a pretty detailed description of how the transmission works. http://gm.ws123.net/EN/documents_200...en.html#T5A0TD

When the ATF is below 15C, the transmission will not go into 4th gear.

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Originally Posted by ontarian_frog

Fourth gear ratio on the automatic is 0.7, that is an overdrive gear.

http://gm.ws123.net/EN/documents_200...en.html#T5A0GS

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I'm calling it as Aisin, the manufacturer describes it. The transaxle is a 4-speed. They do not call 4th gear overdrive.

The service manual you cite is the same transmission, but the manual was written for a Daewoo with a smaller engine. Aisin's specifications for the shift points are entirely different than on the Aveo, which has a 1.6 liter engine.

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Originally Posted by Thymeclock

Quote:

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Originally Posted by ontarian_frog

Fourth gear ratio on the automatic is 0.7, that is an overdrive gear.

http://gm.ws123.net/EN/documents_200...en.html#T5A0GS

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I'm calling it as Aisin, the manufacturer describes it. The transaxle is a 4-speed. They do not call 4th gear overdrive.

The service manual you cite is the same transmission, but the manual was written for a Daewoo with a smaller engine. Aisin's specifications for the shift points are entirely different than on the Aveo, which has a 1.6 liter engine.

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They don't have to. But a gear with a lower ratio than 1 is an overdrive gear. What that means is the output of the transmission is faster than the input. That's all.

How can you guys pull those numbers?

In combined driving (70%HWY/30%CTY) I get 29MPG / 8.2L/100KM... The best I ever got is 33MPG / 7.2L/100KM with a bit of Hypermiling...

I would have to drive way under 100KM/H to come near the numbers I have seen in this thread....