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Thread: Getting better accelaration and mpg with 89octane

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  1. #41
    Senior Moderator DOHCstunr's Avatar
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    Quote Originally Posted by cg1349 View Post
    At 35psi, the car feels sluggish. There is more friction between the tires and the pavement, which causes the engine to work harder to spin the wheels. This uses up more gas. In terms of wear abnormally, the tires are rotated every 6,000 miles. I did the same on the tires on my Sentra, and they lasted for 42,000 miles. The were designed to last for only 36,000 miles. More air = better mpg and longer tire life.

    more air= less traction(not just for going but more importantly for stopping).
    = poor ride quality
    = no matter what you think......... your tires wear unevenly, just like any tire manufacturer will tell you and i think they would know because of the decades of extensive R&D that they, DOT, and insurance companies have done. as well as independant studies. the list goes on.

    You run your 40+ psi, I'll run what Mitsubishi put on my door... 32 front, 29 rear.

    To get better gas mileage.... I won't sacrifice safety. I won't.

    What do i do?
    Well on my 2.0l, 50 trim turbocharged 24 psi, 720cc injector, 255lph fuel pump, with big 8 inch wide tires..........

    I lean the closed loop a/f ratio out whiel cruising to 16.5:1 a/f. And i get about 36 mpg.




    why don't you just try something like that to get the mileage you want.
    Instead of putting yourself and others in danger.
    ______________________________

    1994 Galant GS-Turbo

  2. #42
    I fill up with 93, usually with a half a tank and get over 200 miles on a half.

  3. #43
    Member
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    07-16-2006
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    I just read the research info about the 99' Galant at cars.com and for the V6 engine it says regular unleaded is recommended. It didn't say premium at all. I don't have the owners manual and the sticker on the gas cap was removed, so which is it for the V6? Regular or premium?
    - 2002 Sentra SE-R Spec V (stock)
    - 1999 Mitsubishi Galant V6 (auto)
    "In the past, God overlooked such ignorance, but now He commands all people everywhere to repent. For He has set a day when He will judge the world with justice by the Man [Jesus Christ] whom God appointed. He has given proof of this to all men by raising Him from the dead." Acts 17:30-31.

  4. #44
    premium on the v6
    8G 4 life!

    Mods: CAI,Grounding wires, CCorners, Shaved, 3G STB. AGX/Teins, Addco bar, OZ F1 wheels And well maintained : )

  5. #45
    Experienced TGC Member jimmy_o2's Avatar
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    i run 91 on my i4 with soso driving (easy n hard driving ) mortly easy driving i get almost 360 miles of a full tank i wasnt getting 250 using 89 so thats why i use 91 octane
    03 I4

  6. #46
    I use premium, better performance than 87/89 octane.

    When I used to take my car to the garage for servicing they'd always put 40psi in the tires, very unpleasant when hitting a bump or pot hole.
    Last edited by Gtsnapper; 08-18-2008 at 11:04 AM

  7. #47
    I always use 91/93. Its 55-60 dollars to fill from a quarter tank. 4.29 for 91 octane

  8. #48
    You are here entirely tooo much!!
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    damn are you guys serious? ive gotten like 250 miles from a full tank on my 1-4 G at the most, i use 87. does it really make that much of a difference

  9. #49
    Quote Originally Posted by cg1349 View Post
    I just read the research info about the 99' Galant at cars.com and for the V6 engine it says regular unleaded is recommended. It didn't say premium at all. I don't have the owners manual and the sticker on the gas cap was removed, so which is it for the V6? Regular or premium?
    premium for V6. regular for I4~

  10. #50
    You are here entirely tooo much!!
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    i was using 87 for about a year on my g and just recently went to 91 and BIG difference more hp and drived alot smoother

  11. #51
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    Well cool im not to worried then, I usally run 89 octane, on a 4cyl Non turbo Automatic
    I get horrible gas milage around town. But on the trip to sac. i got 320 miles on 13.2 gallons of Gas. ( Untill the fuel light came on)
    But around town, i average 17.5 MPG. I usally fill up at half and average between 120-130 Miles

  12. #52
    how about for an INLINE 4 CYCLINDER, what kind of gas do u prefer?

    1999 8G Sittin On 18's
    East Coast Duece!

  13. #53
    ive been putting 87 unleaded in my tank for about 2-3 years, it says unleaded only but im looking for more info

    1999 8G Sittin On 18's
    East Coast Duece!

  14. #54
    is it ok to use 87 on the 4 cylinder engine?

  15. #55
    Experienced TGC Member run1206's Avatar
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    Quote Originally Posted by Cobra View Post
    is it ok to use 87 on the 4 cylinder engine?
    yes it is

    02 Mit. Galant 5 Spd -> 2010 Mit. Lancer Sportback 5 Spd -> (current) 2014 Mit Evo GSR 5 Spd
    run1206's Rear Disc Tutorial
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  16. #56
    Member
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    Gonna sell this car. It only has 47k miles on it. It's a '99 Galant ES-V6. Car runs fine, but needs several repairs/maintenance. It's not worth me paying for car repairs when the car is old. $2,000 is my going price. Thanks.
    - 2002 Sentra SE-R Spec V (stock)
    - 1999 Mitsubishi Galant V6 (auto)
    "In the past, God overlooked such ignorance, but now He commands all people everywhere to repent. For He has set a day when He will judge the world with justice by the Man [Jesus Christ] whom God appointed. He has given proof of this to all men by raising Him from the dead." Acts 17:30-31.

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