switching from 87 to 91
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Thread: switching from 87 to 91

  1. #1
    Nooblets Spunjer's Avatar
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    switching from 87 to 91

    so i tried this little experiment to see if it helps my gas mileage. i was averaging 27 mpg, and 50-50 city/hwy.
    been using 87 since i got the car about a couple months ago, although i did tried a tank of 89 to see if it helps with the mileage. i'm not sure if it's coincidental, but when i filled it up with 89, my mpg went up to 31mpg. i switched back to 87, and my mpg went down to 29. well this last fill up i decided to go 91 from walmart (murphy gas). it went up to 34.5. i will try another tank to see if i can maintain this kind of mpg, or improve it some more. the way i look at it, i'm saving money even if i'm using the premium gas. if i can increase my usage to at least about another 40 miles per tank, that's a little over a gallon more. comments?
    Silver2Coupe likes this.
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  3. #2
    Truck? What truck?! scottyrocks's Avatar
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    This is a similar result to what our mileage guru, Silver, gets (just with bigger numbers), and he uses premium.

    You saw these changes after only one tank, or more than one, before switching grades?
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  4. #3
    Big Pimping!!! qingcong's Avatar
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    I think there is validity to premium getting you better MPG, but you probably need to do a couple more tanks to confirm it.
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    Photoshop Masta Beeshabo's Avatar
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    Hmm! interesting.

    Personally I've never used anything other than the recommended octane.
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  7. #5
    Nooblets Spunjer's Avatar
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    qincong, i'm thinking about doing this a couple more times, just to get a more accurate number...
    scotty, youre right about silver... i've been following his posts, but i just have to try it for myself. anyways, yes, the 34.5 (i just went to town and now it's up to 35.6) mpg is after only one tank. here's the history from my last 5 fillups:
    87 = 27.5 mpg
    87 = 27.6 mpg
    89 = 31.5 mpg
    87 = 29.2 mpg
    91 (present) = 35.6 mpg
    like i said, i'm still on the 91 with 320 miles covered and 130 more miles left (range). of note as well, the 87 were purchased from Pilot gas station, the 89 was purchased from Sam's club (Murphy gas) and the 91 was from Walmart (Murphy gas). i'm going to BP on my next fill up...
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    Community Director Scione's Avatar
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    I hope it doesn't have anything to do with the weather changing. I've been getting 4 to 5 mpg more than last month from just getting out of winter.

  9. #7
    Platinum Member Silver2Coupe's Avatar
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    Quote Originally Posted by Spunjer View Post
    qincong, i'm thinking about doing this a couple more times, just to get a more accurate number...
    scotty, youre right about silver... i've been following his posts, but i just have to try it for myself. anyways, yes, the 34.5 (i just went to town and now it's up to 35.6) mpg is after only one tank. here's the history from my last 5 fillups:
    87 = 27.5 mpg
    87 = 27.6 mpg
    89 = 31.5 mpg
    87 = 29.2 mpg
    91 (present) = 35.6 mpg
    like i said, i'm still on the 91 with 320 miles covered and 130 more miles left (range). of note as well, the 87 were purchased from Pilot gas station, the 89 was purchased from Sam's club (Murphy gas) and the 91 was from Walmart (Murphy gas). i'm going to BP on my next fill up...
    Yes premium gas is better. Try using top Tier BP which is what I use. I have not been using Econ for about 6 tanks now and my mpg is not as consistent but getting around 38-40 mpg 50/50 driving. In the winter I was getting 32/35 mpg but it was the coldest on record. Averaging 40 mpg with 50/50 driving with over 80 fillups. Last tank had a few cold days with snow and warm ups early last week and then just drove the car as hard as I could and got 37 mpg last tank with 50/50. I filled up today and getting 46 mpg just driving normal with no Econ. Econ is worth about 5 percent in mpg which is 2-3 mpg. The R18 will just run regular with out premium but when using premium gas there is a Ivtec with the econ cam that will get up to 25/30 percent better mpg. Using premium in a older car or lower compression motor its worth 5-10 percent in mpg alone but not worth the investment.

    The octane of the gas is going up and by late 2015 or early 16 regular will be 94 or 95 ron octane and premium around 100 ron. It wont be R/M method anymore and going back old school. No more mid grade.

    Also its good to reset the learned parameters by cleaning codes with out codes. It erases the fuel trims and the learned timing retard is set to default MBT timing and as long as there is no knock it will stay closer to that timing. Knock retard is a learned parameter and with regular it can take out 10 degrees or more which will also lower power and it adds more fuel which gets wasted in heat into the engine cooling system and out the tail pipe. 5 degree timing retard is about 1 percent in torque but after that it drops off faster so 10 degrees might be 5 percent or more torque loss across the board and not a efficient running motor. The more efficient the motor runs the less stressful the engine is when running (coolant,exhaust and even the trans).

    The best mpg in a tank I got twice. 48.9 mpg with 60/40 highway with econ on and with premium.
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  10. #8
    Platinum Member Silver2Coupe's Avatar
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    Quote Originally Posted by Scione View Post
    I hope it doesn't have anything to do with the weather changing. I've been getting 4 to 5 mpg more than last month from just getting out of winter.

    Colder temps require more fuel and the winter fuel has less BTUs so yes as the weather warms up your mpg will go up to until it gets too hot and running the A/C raises the engine loads. Your mpg should go up until around 80 degrees and then go down again. Lights are worth 10 percent lower mpg too and seen it over the winter. I would try not to use the headlights until I had too and just putting on the marker lights using the DRL.
    qingcong likes this.
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  11. #9
    Nooblets Spunjer's Avatar
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    thanks for chiming in, silver! yes, definitely trying the top tier gas you mentioned in some of your posts. also, what i forgot to mention is that my ECON button was off the whole time. i'm also trying to see if the mpg is better with the ECON off or on...
    Silver2Coupe likes this.
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  12. #10
    Big Timer!!! neoison's Avatar
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    I have a 2013 Civic Si, totally stock.. I have always used 87 fuel now at 6000 miles and average 31.7mpg.. My wife has a 2013 Civic ex sedan and averages 28mpg.. Go figure..

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