I Get Better Gas Mileage When I Use Middle Grade Octane

Save money buy higher octane gas.

I have conducted an fuel experiment with my 1997 kia sephia and had positive fuel savings results. On two tanks of gas I used the low grade 87 octane and achieved an average total driven miles on one tank of gas of 310 miles. Then on the next two fill ups I used the mid grade 89 octane and received an average of 370 total driven miles on one tank of gas. The Mid-Grade gas is around 10c more than the lower grade thus a fill up would cost an additional $1.20 more than the low grade which is 10c cheaper. So for $1.20 more cost at the pump my car can go an additional 60 miles on average. I equate that to a fuel savings.

MPG Calculation:
(1) 87 Octane 25.7 MPG
(2) 87 Octane 24.2 MPG
(1) 89 Octane 31.0 MPG
(2) 89 Octane 28.3 MPG

June15, 2011
Filmed during the hours of 5:00 PM- 6:30 PM
Buckeye, Arizona
Phoenix West Valley

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[Spyster007]

you may have gone further, or filled up later, but what are the MPG comparisons? To be a truely accurate comparison, you would have to figure out your AVerage mpg on the tank of regular fuel, and then compare than to the AVERAGE mpg with midgrade, (hopefully under the same driving conditions) Then you could accurately figure out if you actually saved any money.

[ArizonaPublic]

@Spyster007 - True, Those results are in the description box. Thanks!

[videotitan1]

Is that an air filter on the right side? How come is not the common air filter?

[ArizonaPublic]

@videotitan1 Yep, That's my K&N aftermarket air intake system.

[ArizonaPublic]

@NuggetsOfTruth - It is ugly but it keeps me under the radar. Police take one look at my car and say "No ticket for him, He probably can't even afford to pay the ticket with a car like that"

[SuperTrevontay]

@SpeedyCheeze Thanks for the info You helped me out a lot. Your a good guy.

[SpeedyCheeze]

@SuperTrevontay high octane will work in both, but in a low compression engine it will just make less power, and run slightly dirtier, but you might get better gas millage at highway speed in some (older) cars, though you will get better overall mileage overall with the recommended gas. You just cant use low test gas in a high compression engine, or you could damage it like you described.

[SuperTrevontay]

@SpeedyCheeze Thanks for the info now I know, so your telling me that high octane is good for both high and low compression engines?

[SpeedyCheeze]

@PRXSVR USA uses a different rating system. USA 87 is the same as your regular 91

[SpeedyCheeze]

@SuperTrevontay Higher octane is less volatile, so there is LESS of a chance it pings. In a low compression engine that needs low octane gas only, using high octane only retards the timing and creates an incomplete burn. It actually makes less power ("running smoother"). Low octane burns more quickly and makes more power, but in high compression engines it detonates and ignites itself, so you have to use higher octane gas to prevent "pinging".

[wolfgangiceclaw]

You know, your results may have been positive but I drive 60 +/- miles each day going to and from work and traffic conditions are fairly the same each day and 95% of my drive is on cruise control set at 60mph in a 2000 Ford Crown Victoria and I get a constant average of 26.8 mpg and 360 +/- miles a tank no mater witch fuel I use and take in to consideration I've taken data for over a year and one tank a week. So I say to anyone here do your own testing and see what works for your car.

[SuperTrevontay]

Don't use higher octane you will experience knocking or a ping noise in your engine unless you have a bigger engine yes you will get better performance but later on you will regret buying a new car

[PRXSVR]

I don't understand America, your regular gas has an octane rating of 87. Here in Australia our regular fuel has an octane of 91 and we have 2 others 95 premium and 98 premium I run 91 in my car and it preforms like crap but when I put 95 in it boy does it go well. The engine is a little C14NZ the motor is a 1980's design and she is averaging 5litres per 100km thats about 47mpg

[09victoryrc]

Yep,I get the better miles per gallon also. I use the 91. Runs a lot smoother also.

[spockady]

the higher octane here in australia is about 10c a litre more. that is over 40c a gallon!

but i will try it any way