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Author Topic: Do you use 91 octane or mix grades to save money? Back to Topics
Sal30

Rookie Author
Philadelphia

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Message Posted: Nov 26, 2013 3:13:41 AM

My turbo charged 2002 Volkswagen Passat requires 91 octane gas. I used to just use 93 premium back in the day, but then I realized that I could save money by mixing grades. At first I used to mix 50% 93 and 50% 89 to get 91 octane. I later realized that it was cheaper to mix 66.666% 93 and 33.333% 87 to get 91 octane.
I do waste a little extra time, but I think it's well worth the money I save which will really add up over the lifetime of the car.
REPLIES (newest first) Post a Reply
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bcressy
Sophomore Author Boston

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Message Posted: Apr 14, 2014 2:03:29 PM

No, my car takes 87 :-)
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cityeng
Rookie Author Michigan

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Message Posted: Apr 14, 2014 10:21:25 AM

No
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Awing1
Veteran Author Ontario

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Message Posted: Apr 14, 2014 9:06:35 AM

No, I don't mix it and don't think it's a good idea. Should use fuels what they are designed for, otherwise it might ruin the engine. In that case, you will lose a big thing to save small bucks on the fuel.
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PaylessKY
Champion Author Kentucky

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Message Posted: Apr 14, 2014 8:23:51 AM

No
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Boyrr
Champion Author Allentown

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Message Posted: Apr 14, 2014 5:58:58 AM

I use what the machine is designed for
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deant99
Champion Author Ontario

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Message Posted: Apr 13, 2014 9:17:52 PM

no
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shinysideup61
Rookie Author North Carolina

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Message Posted: Dec 23, 2013 8:56:24 AM

I came across a product that helps fight against the harmful effects of Ethanol. It clears your lines, give better performance using lower octane and gas mileage. They have a 6 tank challenge that I took. After using one treatment I gained an extra 135 miles to the tank. I'm impressed! If you want to check it out go to: scroll to (shop). The challenge costs about 36 bucks but I can see I'll get my returns on my money in no time.
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WEDDY
Champion Author Phoenix

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Message Posted: Dec 22, 2013 9:58:08 AM

No.
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the1roadhog
Champion Author Atlanta

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Message Posted: Dec 22, 2013 7:31:48 AM

Either go for it, or don't.
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charladan
Champion Author Virginia

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Message Posted: Dec 21, 2013 6:52:11 PM

Need to do the math
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pt1KY
Champion Author Lexington

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Message Posted: Dec 21, 2013 6:44:06 PM

no
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PassmyGas
All-Star Author North Carolina

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Message Posted: Dec 21, 2013 10:24:15 AM

no
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Floridaman2013
Champion Author Atlanta

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Message Posted: Dec 15, 2013 7:48:53 AM

Sounds crazy to me. I wouldn't own a vehicle today that requires Premium fuel unless I had the money for all the expenses that go with it. "If you wanna play, you must pay".
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Boyrr
Champion Author Allentown

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Message Posted: Dec 15, 2013 6:24:44 AM

Nope, I use 93 for the car, 87 for the truck, manufacturers recommends
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fet297
Rookie Author Harrisburg

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Message Posted: Dec 14, 2013 7:04:51 PM

I have mixed premium & mid grade in the past.
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minookaband
All-Star Author Illinois

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Message Posted: Dec 14, 2013 5:46:21 PM

no, my vehicles do not benefit from anything higher than 87 octane.
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WEDDY
Champion Author Phoenix

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Message Posted: Dec 14, 2013 12:05:41 PM

No
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Boyrr
Champion Author Allentown

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Message Posted: Dec 13, 2013 12:25:54 PM

no mix, i use 93
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GLM4205
Champion Author Toledo

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Message Posted: Dec 13, 2013 6:25:54 AM

I follow car manufacturers recommendations which does not require 91 octane gas..
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ricebike
Champion Author New Jersey

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Message Posted: Dec 13, 2013 12:43:23 AM

no

my cars don't need premium
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Desoto49
Champion Author KW

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Message Posted: Dec 12, 2013 11:04:42 AM

No
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jl1rp
Champion Author New Hampshire

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Message Posted: Dec 8, 2013 3:45:12 PM

no
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PassmyGas
All-Star Author North Carolina

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Message Posted: Dec 8, 2013 1:34:37 PM

no
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PaylessKY
Champion Author Kentucky

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Message Posted: Dec 8, 2013 10:56:53 AM

No, I use regular 87
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pghbill
All-Star Author Pittsburgh

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Message Posted: Dec 7, 2013 3:23:38 AM

87 octane
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MertieMan
Champion Author Lexington

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Message Posted: Dec 7, 2013 12:32:39 AM

Using 91 octane in an 87 octane engine will not save you money, in fact, it may cost you to get your intakes cleaned by using the higher octane.
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stonejd
Champion Author Illinois

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Message Posted: Dec 7, 2013 12:11:11 AM

No
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carinthuist
Champion Author San Francisco

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Message Posted: Dec 6, 2013 10:40:27 PM

No
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carinthuist
Champion Author San Francisco

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Message Posted: Dec 6, 2013 10:38:57 PM

No
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GLM4205
Champion Author Toledo

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Message Posted: Dec 6, 2013 12:18:48 PM

no what for???
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dontuknowOH
Champion Author Ohio

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Message Posted: Dec 1, 2013 10:59:16 AM

That won't happen. This year........
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Boyrr
Champion Author Allentown

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Message Posted: Dec 1, 2013 10:51:17 AM

93 for the car, 87 for my truck
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Glasman
Champion Author South Carolina

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Message Posted: Dec 1, 2013 7:32:45 AM

wish stations would do like Gulf did many years ago and offer a blend of
half & half..................half regular & half premium.
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eyegotgas2
Champion Author British Columbia

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Message Posted: Nov 30, 2013 3:15:05 AM

Premium gas always costs more.
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maxstar
Champion Author Chicago

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Message Posted: Nov 29, 2013 10:36:30 PM

Sal30, how about updating some gas prices. The updates provide information others can really use to save money.
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carinthuist
Champion Author San Francisco

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Message Posted: Nov 29, 2013 10:32:09 PM

No
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Boyrr
Champion Author Allentown

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Message Posted: Nov 29, 2013 4:37:52 PM

I use 93
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justinemt14
Champion Author Philadelphia

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Message Posted: Nov 29, 2013 2:30:36 PM

No
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PatAZ
Champion Author Tucson

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Message Posted: Nov 29, 2013 10:44:09 AM

No I just run premium.
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OceanArcher
Champion Author Mississippi

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Message Posted: Nov 29, 2013 10:40:28 AM

Nope - no mixing for me ...
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pawnkingfour
Champion Author Georgia

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Message Posted: Nov 28, 2013 2:03:50 PM

Mine requires only regular gasoline.
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ny10
All-Star Author Virginia

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Message Posted: Nov 28, 2013 1:35:19 PM

never ever mix up the grades
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WEDDY
Champion Author Phoenix

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Message Posted: Nov 28, 2013 10:10:11 AM

No, just 87. No need for me to spend for higher octane if my car does not need it.
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Maintroll
Champion Author Lexington

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Message Posted: Nov 28, 2013 9:12:10 AM

91 octane simply does not save you any gas if the vehicle is designed to run on 87 octane. You are totally wasting your money in buying it.
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Boyrr
Champion Author Allentown

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Message Posted: Nov 28, 2013 6:07:42 AM

91
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RS101
Champion Author Minnesota

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Message Posted: Nov 27, 2013 8:04:17 PM

I have done the same.
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WEPSMAN
Champion Author South Dakota

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Message Posted: Nov 27, 2013 7:27:40 PM

I do not try and blend unless I add some #1 diesel to my tank to keep it from gelling.
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Gas_Buddy
Champion Author Maryland

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Message Posted: Nov 26, 2013 2:22:00 PM

First, the 2002 Volkswagon Passat manual doesn't indicate that the car requires 91 octane gas. The manual and the manufacturer notes: "FUEL TYPE Premium unleaded (recommended"

Second, you're saying that you use two-thirds of the higher priced premium fuel mixed with one-third of the lower priced fuel to get a middle grade fuel. That's getting you a higher octane blend, not making the fuel cheaper as your post seems to indicate. (It is cheaper than premium, but that doesn't mean you're necessarily getting what what you in your tank. Which leads to:

Third, and forgetting the time you're taking to do this fuel calculation and mixing, how do you know you're getting the exact amounts you want to get the exact blend you want? That said, higher octane gasolines are designed to burn more slowly and produce a uniform flame propagation in your engine’s cylinder – they’re meant for inside a high compression engine where regular gasoline might start burning before it’s supposed to and cause engine knock.

And you're going to do this "extra time" over the lifetime of the car to save a few cents per gallon? Are you that price conscious about everything else you buy? For example, your cell phone plan? (But then, why pay for a cell phone?) Your stereo or home entertainment system? Your internet/cable connection? Your soda or water that you buy from your local stores? If you're going to try to be this exact about your fuel in order to save pennies, are you wasting ANY other money on ANYTHING else you buy? If you are, then you just wasted your savings on fuel. At least e consistent.

That said, as a long time Gas Buddy member, more than six years with the website, you have 1,700 points, the amount of points most members earn in about two days of membership. Just a suggestion but why not, if you want to help your fellow members save money, post gas prices a little more frequently, helping them be more knowledgeable shoppers, rather than coming up with a labor intensive type of solution that may not do exactly what you're asking? But that's just a suggestion.

Just as an aside, as you're talking about saving money, didn't you once ask if it would save money if you removed your car's radio antenna when you took a long trip?
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rick_evans
Champion Author Boston

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Message Posted: Nov 26, 2013 11:58:42 AM

You're basically doing what the gas station does to pump 89. Around here the price gap between 87 and 89 is typically bigger than between 89 and 91 or 93. Someone who uses 89 can typically save ~$0.20 or more per gallon. A quick calculation using your ratios give savings of about $0.11/gal assuming 93 is close to local area price of 91.
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PaylessKY
Champion Author Kentucky

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Message Posted: Nov 26, 2013 10:30:07 AM

Taking the extra time to do that mix is a bit much. Getting the exact octane you are looking for would be a hit or miss at best. If the vehicle called for 91, and your station sells 93, that is what I would use.

As for mixing grades buying trouble, not so much, unless you miss the 91 octane by a great amount often. Mid-grade is a mixture of regular and premium.
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