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Old 10-20-2008, 05:16 PM   #1
Ronnie D
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2008 Astra XE
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Question Fuel efficiency

When I bought my astra a few months ago, the sticker said I should get 6 L per 100 km on the highway. Is anybody getting close to that??????

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Old 10-20-2008, 05:19 PM   #2
JoeyD
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Default Re: Fuel efficiency

Quote:
Originally Posted by Ronnie D View Post
When I bought my astra a few months ago, the sticker said I should get 6 L per 100 km on the highway. Is anybody getting close to that??????
Stupid metric system.

< / homer>

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Old 10-20-2008, 11:51 PM   #3
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Default Re: Fuel efficiency

Quote:
Originally Posted by Ronnie D View Post
When I bought my astra a few months ago, the sticker said I should get 6 L per 100 km on the highway. Is anybody getting close to that??????
The US window sticker advertises 32mpg (7.4L/100km) on the highway for the 5-speed. 6L/100km is extremely low fuel usage, and I doubt anyone regularly gets that type of fuel economy, especially in any type of mixed, stop and go, hilly, or high speed driving. Maybe at a constant 80km/h on completely flat roads.

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Old 10-21-2008, 12:33 AM   #4
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Default Re: Fuel efficiency

Quote:
Originally Posted by wandern View Post
The US window sticker advertises 32mpg (7.4L/100km) on the highway for the 5-speed. 6L/100km is extremely low fuel usage, and I doubt anyone regularly gets that type of fuel economy, especially in any type of mixed, stop and go, hilly, or high speed driving. Maybe at a constant 80km/h on completely flat roads.
You have to drive carefully to achieve that, but it's achievable, and without going at 80 Km/h on the highway. First, you have to do most of your travels on the highway, second, you have to accelerate relatively slowly (in a manual, shift quickly, around 2500 rpms), keep a constant speed, don't speed too much and if possible follow a few vehicles at a safe distance. If I can get 6,5 l/100 km in a Saturn Ion manual with the 2.4L engine, you should be able to get near 6 in the Astra (if it's a manual).

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Old 10-21-2008, 12:38 AM   #5
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Default Re: Fuel efficiency

Got about 39 mpg this weekend hwy driving.

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Old 10-21-2008, 06:48 AM   #6
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Default Re: Fuel efficiency

this past sunday, made a run from windsor to mississauga. the gas mileage was 46 mpg (imperial) running at 55 mph thru construction (10 miles) & 65 mph elsewhere. cannot cry about that. i have 99 sl1 a/t and have reach 50 mpg travelling at 55 mph.

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Old 10-21-2008, 06:48 AM   #7
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Default Re: Fuel efficiency

Quote:
Originally Posted by Ronnie D View Post
When I bought my astra a few months ago, the sticker said I should get 6 L per 100 km on the highway. Is anybody getting close to that??????
The canadian fuel economy rating that you see on the sticker is way off. It's listed as 46mpg(6.6l/100km) highway and 34MPG(8.4l/100km) city, which are really optimistic numbers and almost impossible to attain.

The recently revised US fuel economy rating is much more accurate and you will be able to match those numbers in real life. 32MPG(7.4l/100km) highway and 24MPG(9.8l/100km) city.

I have managed myself to get 36MPG highway and 25MPG city.

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Old 10-21-2008, 07:05 AM   #8
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Default Re: Fuel efficiency

I have twice been able to get 42.8 MPG according to the BC averaged over 30-40 miles. In both of these occasions, it was immediately after a fill-up which occurred shortly before getting on the highway and after having already driven many miles (i.e. the engine was definitely warmed up). So 6L/100 km (39.2 MPG by my calculation) is achievable, but not easy nor common. My best complete tanks were around 36-37 MPG.

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Last edited by ad_astra; 10-21-2008 at 07:19 AM.. Reason: adding detail

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Old 10-21-2008, 08:36 AM   #9
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Default Re: Fuel efficiency

Quote:
Originally Posted by ad_astra View Post
I have twice been able to get 42.8 MPG according to the BC averaged over 30-40 miles.
I think you left out the part about going down hill.

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Old 10-21-2008, 08:54 AM   #10
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Default Re: Fuel efficiency

your mileage will also improve over time; when new my 5-sp XE was using 9.3 liters/100km, now after 2 months it's down to 9/100 km and I expect it to continue to fall.
I'm not really a very conservative driver so my consumption figures are always going to be high.
Every accessory you run, especially AC, raises your consumption too.

Consumer Reports tested an automatic and rated it at 28mpg in the States.

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Old 10-21-2008, 09:25 AM   #11
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Default Re: Fuel efficiency

6l/100km with the 1.8 petrol? No way. I average around 6.2 mixed driving and I'm a bit unhappy with my poor fuel economy. But I have no patience with slow people either...

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Old 10-21-2008, 09:37 AM   #12
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Default Re: Fuel efficiency

My fuel economy seems to be really well and it improves each tank.

I'm a salesman and I spend lots of time stuck in traffic and starting and stopping.

If I do a lot of sales calls I can get as low as 28 mpg while running the AC.

My current in town tank is 31 mpg (no AC) where-as my BC will commonly read 42-44 mpg (no AC) on my highway commute that still has several stoplights and heavy traffic.

I know from experience that the 18" wheels can easily use up to 2-3 mpg compared to hi-efficiency Michelins on 16" wheels so I'm really impressed.

Really the mpg is not much less than my old tdi.

Also, the motor has REALLY loosened up and it much more fun to drive now as it is much peppier.

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Old 10-21-2008, 09:50 AM   #13
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Information Re: Fuel efficiency

I have over 8,000 miles on my 2008 astra XR, auto, and get an average of 27.05 mpg combined

I track ALL my mileage and fuel usage and this is what Ive gotten so far, 60% highway and 40 city driving, Im a conservative driver too, this is pretty much in line with what www.fueleconomy.gov EPA estimates say I will get and it hasnt improved.

I think alot of peole on this forum tend to exagerate a bit

standard transmission do get a little better though

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Old 10-21-2008, 11:16 AM   #14
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2008 Astra XR
Default Re: Fuel efficiency

I would book mark this site:

http://www.fueleconomy.gov/feg/findacar.htm

It tells the REAL fuel milage based on the company that does the survey (they test with A/C on as well) and from drivers as well.

I used this site when I was looking for a vehicle

Brad

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Old 10-21-2008, 11:24 AM   #15
craigtnutz
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Default Re: Fuel efficiency

Quote:
Originally Posted by djmtz1 View Post
I have over 8,000 miles on my 2008 astra XR, auto, and get an average of 27.05 mpg combined
My experience has been similar. I have over 7,000 miles on my 2008 astra XR, auto, and average 29.7 mpg combined. Roughly 60% highway/40% city.

Not bad considering my propensity towards spirited driving.

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Old 10-21-2008, 11:43 AM   #16
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Default Re: Fuel efficiency

Quote:
Originally Posted by djmtz1 View Post
I
I think alot of peole on this forum tend to exagerate a bit
I don't think so.

Last tank in my wife's car netted 319 miles on 9.4 gals.
That equates to:33.93 mpg.

The BC regularly reads about 32-33 mpg most of the time.That gizmo is pretty close to using the old method of stopping the fillup @ first click. Then dividing gals. into miles driven. I would give it plus/minus .5 mpg.

I find it hard to believe some people are getting only 25-28 mpg.
Are they driving the hell out of their slushboxes

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Old 10-21-2008, 12:16 PM   #17
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Default Re: Fuel efficiency

Use http://www.spritmonitor.de/en/

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Old 10-21-2008, 04:07 PM   #18
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Default Re: Fuel efficiency

I'm averaging 8.6L/100km according to the computer, thats with mostly city driving with a heavy foot, but no traffic.

The most real world kms I've gotten to a tank before filling up was 492kms, at the low fuel warning.

You can't have a super fun car and expect to get 45 mpg. Drive a Prius and see which car you like more

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Old 10-22-2008, 10:19 AM   #19
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Default Re: Fuel efficiency

Quote:
Originally Posted by djmtz1 View Post
I have over 8,000 miles on my 2008 astra XR, auto, and get an average of 27.05 mpg combined

I track ALL my mileage and fuel usage and this is what Ive gotten so far, 60% highway and 40 city driving, Im a conservative driver too, this is pretty much in line with what www.fueleconomy.gov EPA estimates say I will get and it hasnt improved.

I think alot of people on this forum tend to exagerate a bit

standard transmission do get a little better though
The 5 speed manual tranny is not just "a little better" in fuel economy in my experience; it's a lot better. The #'s I stated were not that "one day on the highway". I hand calculate my mpg and save all mpg tanks (w/ notes on driving, AC use, and weather) w/ no exceptions for traffic or inclement weather.

I attribute my fuel economy to a couple of things:

1) I broke it in HARD. As soon as I felt it was warm off the dealer's lot it got multiple full throttle runs to redline w/ long slow downs w/ the car in gear. This promotes good ring seal.

2) I don't drive it that soft. I accelerate in a spirited manner on a regular basis and I always do several redline runs per tank. Lugging the motor under a load is not good for mpg. When I want to accelerate semi-briskly and save fuel I shift at about 3500 RPM to ride the tq curve. I often drive between 70-80 mph but w/ several complete stops for traffic resulting in an average speed of around 32 mph most tanks. When I do sales calls economy will drop as low as 27-28 mpg but that is because I might do 25 stops a day in only 80 miles.

3) I do plan my stops and coast when possible. I also plan for the hilly terrain by gaining speed before the hills and taking advantage of the downhills. I also maintain space between me and other cars even in traffic to try and avoid hitting the brakes.

4) Try to limit AC use but when it's hot, I run the AC. I believe driving a white car in TX saves gas because it allows you to run the AC less. My AC has no problem freezing me out on setting 1 (recirculate vents, white car, tinted windows, 3 door) even on 100 degree days.

5) I always run my tires at max inflation pressure and I have done this for years. This makes a BIG difference and the tires last a very long time like this. It will ride a bit rougher however.

When I removed the 16" wheels off my tdi (my previous car) and installed some very lightweight 18"s (much lighter than these stock 18"s) I lost over 3 mpg. I know w/ some hi-efficiency Michelin's on some 16"s the Astra would do much better for mpg.

I always fill up first thing in the morning when fuel is at it's most dense BTW.

Also, I suspect the BC is actually 100% correct and that the variance while hand calculating comes more from other factors. For example: The injectors actualy use 8 gallons but the remaining fuel in the tank expands due to ambient heat increasing not allowing you to replace those 8 gallons exactly but instead only allowing you to put in 7.8 gallons. Add to that pump variance, tilt on the concrete, different levels of sensitivity for the shut off switch, etc. and your hand calculated #'s can be off.

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Old 10-22-2008, 04:09 PM   #20
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Default Re: Fuel efficiency

I have just over 1000 miles on my Astra, and I am averaging over 28 according to the BC (over 80% city/suburb streets) with the manual. I have one BC page that I haven't reset (it actually isn't even all my driving, since they picked it up for me at a dealership about 100 miles away). The other BC I reset after each fillup.

As I am getting used to driving the manual, the mileage is improving. My current tank is at over 31 mpg (I'm about 2/3 through this tank). I always coast toward lights in gear so the injectors can shut off - this seems to help alot. I probably make the people behind me angry, but it definately helps the mileage. I also set the cruise control when I can - that seems to help too.

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