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Old 10-24-2009, 08:33 PM   #41
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Default Re: 2500 - the magic number

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Originally Posted by Teh_Freak View Post
Nope, manuals typically get better mileage regardless of city/highway conditions. This is slowly starting to change though with dual clutch transmissions, which would be pretty sweet to get one from an Audi TT or A3 thrown into the Astra, paddles included!
But it seems to me an identical engine at 2500rpm should be using less gas than an identical engine running at 3000rpm? No? And what's your take on the highway performance of this car. I'm not a speed demon by any means, I just don't want an engine that sounds like it's going to pop if I go 110-120km/h... (75-80mph).

My car should be delivered mid next week and I'm having post-purchase anxiety

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Old 10-24-2009, 08:41 PM   #42
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Default Re: 2500 - the magic number

BC indicates I'm running at 9.7 l/100km, so I'm somewhat happy with this, considering I'm not the slowest driver. I just hit 3300 kms, IIRC.
lol I remember reading up here that someone found 60 mph slow... that is, in my province, the speed limit on all major highways. 100 km/h. I won't even get into secondary roads, collector highways, and service roads. 90, 70, and 50 km/h, usually. What a joke.

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Old 10-24-2009, 08:49 PM   #43
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Default Re: 2500 - the magic number

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Originally Posted by Teh_Freak View Post
Nope, manuals typically get better mileage regardless of city/highway conditions.
Not all the time... It all depends on the gearing of the transmission.

Manual VUE's operate at a higher RPM than the automatics, and get lower highway mileage.

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Old 10-24-2009, 08:51 PM   #44
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Default Re: 2500 - the magic number

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Not all the time... It all depends on the gearing of the transmission.

Manual VUE's operate at a higher RPM than the automatics, and get lower highway mileage.
Could someone then tell me how the manual Astra gets better highway fuel economy compared to the automatic, when it's a good 500rpm more at 100km/h (60mph?)

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Old 10-24-2009, 09:01 PM   #45
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Default Re: 2500 - the magic number

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Originally Posted by silver_star View Post
But it seems to me an identical engine at 2500rpm should be using less gas than an identical engine running at 3000rpm? No? And what's your take on the highway performance of this car. I'm not a speed demon by any means, I just don't want an engine that sounds like it's going to pop if I go 110-120km/h... (75-80mph).

My car should be delivered mid next week and I'm having post-purchase anxiety
I can only comment on the automatic equipped Astras, at 70mph the engine is running just under 3000rpm, 80 is pushing it towards 3700rpm I believe (not too sure though, haven't been that fast in quite awhile). People complain about noise in this car, but I don't see why; the engine is pretty damn quiet and you won't really "hear" it until you get up to around 4000rpm.

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Old 10-24-2009, 09:07 PM   #46
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Default Re: 2500 - the magic number

I know this is a bit off-topic, but I can't help it.

Am I the only one who finds the sound you get, revving at a red light, from 1000 to 1400 rpm? that groan is so damn sexy... lol

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Old 10-24-2009, 09:08 PM   #47
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Default Re: 2500 - the magic number

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Originally Posted by Teh_Freak View Post
I can only comment on the automatic equipped Astras, at 70mph the engine is running just under 3000rpm, 80 is pushing it towards 3700rpm I believe (not too sure though, haven't been that fast in quite awhile). People complain about noise in this car, but I don't see why; the engine is pretty damn quiet and you won't really "hear" it until you get up to around 4000rpm.
Thanks for that I guess the 4000 mark in the manual is about 80mph, so I'll have to stay below that Thanks for your posts.

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Old 10-24-2009, 09:09 PM   #48
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Default Re: 2500 - the magic number

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I know this is a bit off-topic, but I can't help it.

Am I the only one who finds the sound you get, revving at a red light, from 1000 to 1400 rpm? that groan is so damn sexy... lol
I'll let you know when I actually get mine But I've heard the engine sounds pretty sweet.

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Old 10-24-2009, 09:10 PM   #49
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Default Re: 2500 - the magic number

lol, it's no V8 symphony, but it does have a good tone to it.

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Old 10-24-2009, 09:26 PM   #50
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Default Re: 2500 - the magic number

Quote:
Originally Posted by silver_star View Post
But it seems to me an identical engine at 2500rpm should be using less gas than an identical engine running at 3000rpm?
RPMs aren't directly linked to fuel economy in this case. If we assume that two Astras -- one with an automatic transmission and one with a manual transmission -- weigh exactly the same, produce the same amount of drag, have the same rolling resistance, etc., both cars should require the exact same amount of energy to run continuously on the highway at 60 MPH for one full minute. How that amount of energy is produced can vary. With the automatic, it is being produced using only 2500 engine revolutions (RPMs), while the manual is doing it over the course of 3000 RPMs. But over that full minute, both engines must produce the exact same amount of energy (or "work") to keep the cars at speed. So our automatic is working a little harder, consuming more fuel per cylinder firing than our manual transmission, but over the course of a full minute, the difference is almost zero (due to the lock-up torque converter).

Where things get muddy is in the engine's "efficiency" at different RPMs, and is why we have transmissions with different gears (or CVTs that vary their ratio according to the "work" required).

Quote:
Originally Posted by silver_star View Post
And what's your take on the highway performance of this car. I'm not a speed demon by any means, I just don't want an engine that sounds like it's going to pop if I go 110-120km/h... (75-80mph).
It doesn't (sound like it's going to pop).

...
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Old 10-24-2009, 09:37 PM   #51
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Default Re: 2500 - the magic number

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Originally Posted by Astra La Vista! View Post
RPMs aren't directly linked to fuel economy in this case. If we assume that two Astras -- one with an automatic transmission and one with a manual transmission -- weigh exactly the same, produce the same amount of drag, have the same rolling resistance, etc., both cars should require the exact same amount of energy to run continuously on the highway at 60 MPH for one full minute. How that amount of energy is produced can vary. With the automatic, it is being produced using only 2500 engine revolutions (RPMs), while the manual is doing it over the course of 3000 RPMs. But over that full minute, both engines must produce the exact same amount of energy (or "work") to keep the cars at speed. So our automatic is working a little harder, consuming more fuel per cylinder firing than our manual transmission, but over the course of a full minute, the difference is almost zero (due to the lock-up torque converter).

Where things get muddy is in the engine's "efficiency" at different RPMs, and is why we have transmissions with different gears (or CVTs that vary their ratio according to the "work" required).



It doesn't (sound like it's going to pop).
All very good information and very informative, thanks very much! I still wish it was lower, but I realized there was a tradeoff when I bought the car (ie: price, standard features, curb appeal and uniqueness with a bit less power than a Mazda3). I read somewhere it's tuned to run a bit higher on purpose and still have power to overtake on the highway or get up a hill. Hope that's the truth! I'll do mostly city driving anyway, but have to drive it 400 km from the dealer home (didn't much like the dealer in my home town!)

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Old 12-01-2018, 05:27 AM   #52
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Default Re: 2500 - the magic number

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Originally Posted by marx404 View Post
http://www.metric-conversions.org/vo...id-gallons.htm

http://www.metric-conversions.org/le...s-to-miles.htm

...but than again as dangerd points out, he has a stick. Sticks will typically get better mileage than an automatic.
Thanks or you can also try these converters:
Volume conversion
Length converter

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Old 08-12-2019, 05:00 PM   #53
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Default Re: 2500 - the magic number

8000 rpm idle seems rather high. you might want to get that checked out. maybe it's just an automatic thing though.

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