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  1. #11
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    stephan's Avatar
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    Quote Originally Posted by 99'HEARTBEAT View Post
    x3....On what....Murdog94....Silvertrailblazer on going with....87 Octane....


    Too many people drive around with medium or premium gas in their tank when they just don't need to. If your owner's manual says "regular", it means it. Putting mid-grade or premium in is just wasting money. Why? Unless you have a high-compression engine which could be prone to detonation (pinking / pinging), you have absolutely no need for high-octane petrol. The only thing that higher octane gives you is less probability of detonation. In high-performance Vehicles with high-compression engines, that means allowing the engine management system to work at peak efficiency but for probably 75% of you, your Truck will quite happily run on the cheapest petrol you can put in it. Not an improvement in fuel economy per said, but a money saving at least.
    Exactly!! High octane fuel is for high compression engines, or towing, because it BURNS SLOWER & is not as prone to detonation/pre-ignition/pinging. Lower octane fuel is actually "more volatile" because it burns faster, & more completely, therefore, more efficiently, (& you get more bang for your buck.) This "faster burning" gives better mpg & more power for your stock compression street engine. You are burning more of what is input into the cylinders, instead of sending 10%-20% of it into the exhaust system where the cat converter has to scrub it.. The only reason race cars make more horsepower on "high octane" fuel is because they're running 12:1 to 15:1 C.R engines & they're cramming more of it in there!! lol
    Last edited by stephan; 11-19-2010 at 02:14 PM.

  2. #12
    Master Mechanic silverhobey's Avatar
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    I agree with Mike about the 'not-needed to run premium' fuel. I run premium only in any older vehicles when I go for a long run on 100 KM/hr . highway to get er' cleaned out. The reason for this is that 90 % of our driving is start-stop-intown and I have found that after a long run on premium for a tank or 2, they just seem to run better. I also agree that the better fuel will not improve your mileage to the cost of the difference of actually buying the higher - grade ..........Brian from Ontario, Canada

  3. #13

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    oil companies stared that myth in the seventy's,higher octane gas give you better mileage. they had to stop saying it because its was not true.
    no matter what anybody saids there will be people who still believe it. you will never hear it advertise tho. 87 octane is best for are engines.

  4. #14
    Legend Bigbomber's Avatar
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    Quote Originally Posted by silverhobey View Post
    I agree with Mike about the 'not-needed to run premium' fuel. I run premium only in any older vehicles when I go for a long run on 100 KM/hr . highway to get er' cleaned out. The reason for this is that 90 % of our driving is start-stop-intown and I have found that after a long run on premium for a tank or 2, they just seem to run better. I also agree that the better fuel will not improve your mileage to the cost of the difference of actually buying the higher - grade ..........Brian from Ontario, Canada
    AGREE 100%,Good info here!
    [/SIGPIC]2009 Chevy Silverado LT 1500 EXT CAB 4X4 Vortec 4.8L SFI,K&N air filter,Weathertech Floor Liners ,Weathertech Stone/Bug Deflector, Line X Spray On Bedliner, TruXport Rollup Tonneau Cover, Molded Mudguards, Viper 5701 LE 2 way Security Alarm/Remote Starter, Xm Satelite Radio,BILSTEIN 5100 rear shocks,BILSTEIN 5100 front levelling shocks,READYLIFT 2" rear lift blocks,Goodyear Wrangler Territorys -265/70R 17"

  5. #15

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    Yes running high octane w/o a programmer is useless, may even cause problems.

    There's a lot of things you can look into for a change your gas mileage though too. If your truck can run E85 find an E85 station, our 5.3L trucks get 25 more hp off E85, or if you have a programmer like mine you get 70 more HP off E85. However it doesn't offer as good mileage as gas does (but most places I have seen it is a little cheaper).

    I run high octane in my truck and it gets good gas mileage depending on the driving conditions. I have 4.56 gears so there is no strain on the engine cruising around at 30-60mph, and so it automatically goes into 4-cyl mode. If you are driving with big gears in the city, say goodbye to gas mileage. Find out what gear ratio you are running, and if you can afford swapping down to 3.73 or lower that will def improve your mileage. Also look into wheel/tire size, driving habits, and little things like air filter being clean and your engine having fresh oil/tune up.
    ROTARYENGINEPETE
    '07 GMC SIERRA SLT | Z71 | 4X4 | 5.3L FF

    LIFT:
    ROUGH COUNTRY 3" PREMIUM SUSPENSION LIFT + ADD-A-LEAF
    18" ATX THUG WHEELS
    33" NITTO TRAIL GRAPPLER TIRES
    EBC SPORT ROTORS
    EBC YELLOW STUFF BRAKE PADS
    LIGHTING:
    HELLA/VVME 4300K HID LOW BEAMS

    HELLA BLACK MAGIC OFFROAD LIGHTS
    ANZO USA PROJECTORS HEADLIGHTS
    ANZO USA LED TAIL LIGHTS
    ENGINE:
    K&N 63 SERIES INTAKE
    MAGNAFLOW CATBACK D.O.S.I.F.T. EXHAUST
    BULLYDOG TRIPLE DOG GT TUNER

    PULSTAR IGNITORS
    OPTIMA RED TOP
    DRIVETRAIN:
    YUKON 4.56 GEARS
    MAG-HYTEC DIFF COVER
    CORVETTE SERVO
    TRANSGO SHIFT KIT
    Z-PACK 3-4 CLUTCH
    REBUILT WARN XFER CASE
    BODY:
    RUNCOOL HOOD LOUVERS
    FULL WEATHERTECH VISORS/BUGSHIELDS
    DUPONT BEDLINER

    DEEZEE BLACK DIAMOND PLATE BED CAPS
    BULLDOG LOCKING SPORT FUEL DOOR
    DOOR MOLDINGS REMOVED
    CUSTOM WIRE MESH GRILL
    BUSHWACKER BOSS FENDER FLARES
    CB THRU GLASS RADIO ANTENNA

    5.5sec 0-60mph on pavement (5.2sec running E85), and a little less in 3 feet of muddy water

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