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Old 03-08-2008, 01:52 AM   #1
rmlimage
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Happy Gasoline - Regular, Mid Grade, or Premium?

Okay, I have had my Astra for exactly one week. I love driving it. Gas mileage between snow storms has been around 26 mpg.

My question to all you Astra drivers and experts are what type of gasoline should my Astra take to give me the best gas mileage and no knocking? According to the manual, they recommend 87 or mid grade gasoline. Is everyone following this or trying 85/regular or the premium stuff? Any thoughts, comments would be greatly appreciated.

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Old 03-08-2008, 08:48 AM   #2
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Regular will be just fine.

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Old 03-08-2008, 09:02 AM   #3
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Given the compression ratio of the engine and the electronic management of OBDII, 87 octane should be just fine. Everything I have read over the years bears this out. Spending extra money for higher octane fuel in the stock motor is not going to get you anything, except less money in your pocket. The oil companies are working very hard on that part already without your assistance. 87 octane hit $3.30 a gallon here yesterday and I'm sure it is higher elsewhere in this country.

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Old 03-08-2008, 09:15 AM   #4
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

At the QT where I buy fuel, regular was "just" $2.97/gallon yesterday. Within 30 days I expect all three grades to rise in price.

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Old 03-08-2008, 02:59 PM   #5
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

The minimum we use over here is 95 but the normal is 97, then we have 99 with a few BP stations offering 102. We are now near to 5/gallon or $10 US and thats for 97

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Old 03-08-2008, 07:08 PM   #6
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Where are you that you can get 85? I've never seen less than 87 here.

I just got gas this afternoon, and diesel was $3.95/gal. This at one of the cheaper places in the area.

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Old 03-08-2008, 07:21 PM   #7
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Use 87. When the car gets old a tank of premium might help eliminate knocking (it did in my SC2). In that case mpg went down. I've also heard that using high octane may actually hurt your engine.

I suspect that Europe uses a different method for computing octane ratings.

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Old 03-08-2008, 07:42 PM   #8
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Quote:
Originally Posted by L200Pilot View Post
Where are you that you can get 85? I've never seen less than 87 here.

I just got gas this afternoon, and diesel was $3.95/gal. This at one of the cheaper places in the area.
Sunoco stations around here used to sell 85. I haven't been in one lately to see if they still do.

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Old 03-08-2008, 08:25 PM   #9
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Quote:
Originally Posted by L200Pilot View Post
Where are you that you can get 85? I've never seen less than 87 here.

I just got gas this afternoon, and diesel was $3.95/gal. This at one of the cheaper places in the area.
I've seen 85 in Denver. All the octanes were two points lower... The ION only gave me 20 mpg combined city driving... I assumed the altitude and the gas contributed to the lower mileage.

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Old 03-09-2008, 01:30 AM   #10
rmlimage
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Default Mid Grade - 87 it is!

Thanks for all the replies advice. They have 85 down here in Colorado Springs as well. Regular- 85 goes for $2.93 and up. Mid-Grade 87, I have found it as low as $3.03. and Premium I think 91 is at $3.10.

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Old 03-09-2008, 08:47 AM   #11
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

I believe the octane rating has to do with the altitude and some other factors (higher altitudes require less), which is why the Octane rating drops in the Midwest...

LOL The highest octane regular gas I've ever seen in the US was the Sunoco 94, and that's been gone for at least five years now. And that was marketed for owners of high end performance vehicles such as the Ferrari and Porch, which in turn marketed it to everyone else..

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Old 03-10-2008, 10:52 AM   #12
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

We have two (three) kinds of petrol, 95 and 98 (and V-Power) in Europe, 95 is equal to 91 US octane, 98 is 94 US octane. V-Power is 101 octane which in the US would be something like 96.

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Old 03-10-2008, 07:38 PM   #13
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

The Astra should be fine on 87 octane; it's the high-compression and direct injection turbo fours like the LNF that require premium fuel for optimum performance. The 2H0 motor (1.8L Ecotec) has economy in mind. Double check your owners manual, just to be sure. Doesn't anyone read these things anymore?


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Old 03-10-2008, 07:53 PM   #14
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Quote:
Originally Posted by GR898SL2 View Post
Double check your owners manual, just to be sure.
It's 87.

...
The family:
1993 SL2: 051,000 mi (!)
1996 SL2: 260,000 mi (sold)
2001 SL2: 98,000 mi
2002 L200: 215,000 mi
2006 VUE: 50,000 mi (sold)
2007 Ranger: 40,000 mi
2008 Astra: 161,000 mi

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Old 03-10-2008, 11:58 PM   #15
rmlimage
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Yes, I did read the manual, but with the cost of gas, I wonder if I could get away with a low octane without any damage to the engine. Based on everyone comments, I plan to stick with 87, but I sure hope gas prices will eventually drop.

Quote:
Originally Posted by GR898SL2 View Post
The Astra should be fine on 87 octane; it's the high-compression and direct injection turbo fours like the LNF that require premium fuel for optimum performance. The 2H0 motor (1.8L Ecotec) has economy in mind. Double check your owners manual, just to be sure. Doesn't anyone read these things anymore?

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Old 03-11-2008, 07:26 AM   #16
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Quote:
Originally Posted by rmlimage View Post
but I sure hope gas prices will eventually drop.
Now there's a definition of a fat chance! Sorry, but I predict it will only get worse.

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Old 03-15-2008, 10:59 PM   #17
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

i know i know, but we can all dream likes it is the 1990's or at least before the Iraq War

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Now there's a definition of a fat chance! Sorry, but I predict it will only get worse.

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Old 03-16-2008, 12:30 PM   #18
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

The chances of $4/gal regular 87-octane fuel by the fourth of July (if not sooner) are very good. Premium fuel, which is recommended by Nissan for the VQ35DE engine in my Maxima, (91 octane or better) is closing in on $3.65/gal in my area.

The nationwide average cost of regular fuel has already broken a record set on August 29, 2005 (the day Katrina made its second landfall on the LA/MS border) and is only a few cents off its 1981 high adjusted for inflation.

Compared to other countries, our gas is still relatively cheap, but who knows how much longer that advantage will last as China and India demand more oil and rapidly industrialize. That's why Astra owners (as well as drivers of fuel-efficient subcompacts that are not the tin-foiled deathtraps of yore) will laugh all the way to the bank.


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Last edited by GR898SL2; 03-16-2008 at 12:35 PM..

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Old 03-16-2008, 05:33 PM   #19
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Default Re: Gasoline - Regular, Mid Grade, or Premium?

Pfff whine whine
My diesel is now $8 a gallon.

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