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87 vs 91/93 Octane Gasoline

25692 Views 30 Replies 20 Participants Last post by  Flew
I know is rated to run 87, however does anyone think there are any long term repercussions? Is it harder on the engine over time?

Not that I would run 87, but more of a curiosity factor.
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Ford is OK with it and the computer is set up to work with tha in mind, so I don’t see any issue witg it. I consider making the switch, but it's not like the $25 or so a month is going to kill me and I plan to tune eventually.
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I buy gas at Costco where 93 is the same price (or 5 cents more per gallon) as 87 at other stations, so I wouldn't even consider 87 anymore, especially given the noticeable performance gains.

That being said, if 87 is printed in the owners manual I doubt it would cause harm long term.
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When my wife bought her Q5, (supercharged V6), the sales guy asked her to stay
away from BP and grocery store gas.
Said they've had more people come in with check engine lights using Sams or Costco gas, I believe he was referencing the supercharged engines only.
It's cheaper for a reason I suppose.
I know for a fact my MKZ gets better gas mileage using Shell gas over a local cheap gas station.
I know I'm getting better fuel economy and better performance with Shell 93 Octane
When my wife bought her Q5, (supercharged V6), the sales guy asked her to stay
away from BP and grocery store gas.
Said they've had more people come in with check engine lights using Sams or Costco gas, I believe he was referencing the supercharged engines only.
It's cheaper for a reason I suppose.
I know for a fact my MKZ gets better gas mileage using Shell gas over a local cheap gas station.
That seems like the kind of line a salesman would use. There have been many studies on this. Here is a recent one:

AAA Study Finds Drastic Differences In Gasoline Quality

Costco gas is cheaper because of the wholesale process, nothing more. I cannot speak for Sam's club.
I have been running 87 octane for my weekly commute because it's $1 per gallon cheaper and I do over 300 miles per week. I haven't had any issues at all. My mileage is virtually identical to the first tank I ran with all premium. Performance difference hasn't really been noticeable.

I wish I could find 93 octane for only $0.05 cents more than 87 octane.
I have been running 87 octane for my weekly commute because it's $1 per gallon cheaper and I do over 300 miles per week. I haven't had any issues at all. My mileage is virtually identical to the first tank I ran with all premium. Performance difference hasn't really been noticeable.

I wish I could find 93 octane for only $0.05 cents more than 87 octane.
You are in Chicagoland area? Costco in Niles has 93 for 2.75 or Costco in North Riverside which has 93 for 2.63.

Go to Chicago Gas Prices - Find Cheap Gas Prices in Illinois and punch in your zip code.
Said they've had more people come in with check engine lights using Sams or Costco gas, I believe he was referencing the supercharged engines only.
It's cheaper for a reason I suppose.
Costco is top tier Gas, so I call BS on this>:). Not sure I would be taking the word of a salesman on this.
Licensed Brands | Top Tier Gas
I know for a fact my MKZ gets better gas mileage using Shell gas over a local cheap gas station.
Yes don't buy your gas from a no name dealer. Most Shell premium gas(92) isn't ethanol blended so this might be true. I buy higher octane 94 at a Major chain so this isn't an issue:D.
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Thanks for the feedback guys! Was just concerned more about engine longevity...

Yeah my limit is like 60c more a gallon. $1 over regular for premium is a lot.

I'm in Long Island, NY. It's usually around 40 cents more on average for premium 93
You are in Chicagoland area? Costco in Niles has 93 for 2.75 or Costco in North Riverside which has 93 for 2.63.

Go to Chicago Gas Prices - Find Cheap Gas Prices in Illinois and punch in your zip code.
Thanks. I'm in the Tinley Park area and work in Oak Brook. I was able to locate a Speedway and two Shells which are $0.30+ cheaper than the normal two gas stations I frequent. I didn't even know Costco sold gas. Do you need a membership to buy their gas?
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Thanks. I'm in the Tinley Park area and work in Oak Brook. I was able to locate a Speedway and two Shells which are $0.30+ cheaper than the normal two gas stations I frequent. I didn't even know Costco sold gas. Do you need a membership to buy their gas?
Yes, to purchase gas from Costco, you must be a member. However the gasbuddy website will help you find other gas stations that have better prices.
Anyone in Ontario give an insight as to how it is with 91 or 94 octane. 93 octane isn't really available in most of Ontario but 94 is fairly available. Is it better to have higher then 93 or can 94 cause issues?
94 octane has been available at Sunoco stations around here for a long time. It is sold as Sunoco Ultra 94. I haven't used it in anything I'm driving for a long time mainly due to price per gallon.
Toronto and area has a few options for 93 or 94 octane, though it is expensive. Heck 91 just jumped to 1.269 a liter here.
Some BJ's also sells gas, as well as *some* costco's (some do not). You do not necessarily need to be a member at BJ's, but the price is cheaper for members.

The gas is top tier quality as well. One thing you can rest assured is they won't put water in their gas because they have nothing to gain. Some low tier gas stations do to save money, even high tier (rarely). For instance, I've had a BAD experience at Sunoco once which is indeed top tier gas. Knocking all over the place. So it also depends on the area you live in and if you trust them.

Edit: I actually don't see BJ's on the official top-tier gas list, however I'm sure it's no different than Costco as both are wholesale. I never had a problem with BJ's


/sigh Guess I could take a trip to Arizona to try out 93... lol
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Remember that 380 lb/ft claim was with 93 octane and probably E0 at that. Reduced performance will come with lower octanes as the computers compensate for that. Also Shell V-Power is the best gas around, I just wish I could afford to put it in every time.
Also Shell V-Power is the best gas around, I just wish I could afford to put it in every time.
Based on what?
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