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  1. #61

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    I know this thread is somewhat old, but I've had 2 Silverados, both with 5.3 and AFM and have LOVED them both.

    IMO, turning off the AFM is kind of a dumb idea and will hit your gas mileage, but it is a choice.

  2. #62

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    @Kapelusprime hit the nail on the head with some of his thoughts on this. I notice when my AFM kicks in but it is no way annoying. I also noticed that around 6k miles the transmission began shifting a lot less. So I do believe the transmission does "learn" driving style. I originally thought this was BS when I was told it but I now know it to be fact. I will also suggest that the fuel octane does make a difference in how "seamless" the AFM is. I put 87 octane in at one point and did notice the "jerking" that some here speak of. I now put in 93 octane and have noticed no more jerking and have actually gained almost a full 1 mpg. So at 13 cents more a gallon at approximately 25 gallons is $3.25 more per fill up, the math is a no brainer for me to stick with the 93 octane.




    2011 Silverado CrewCab 5.3L*Ram Air Look Cowl Induction Reflexxion Hood*6" Pro Comp Lift*Flowmaster Dual exhaust*Perfect Launch Rear Diff. Cover*Led Smoke Taillights*L.E.D.Smoke 3rd Brakelight*60" L.E.D. Tailgate Bar*Rearview Mirror Reverse Camera and Sensors*Smoke Headlight Covers*Front Bumper Grill Insert*Deezee Black Alum. Diamond Rail covers*20" Ultra Motorsports Rims wrapped with 35.5"B.F. Goodrich Tires*Inchannel Raingaurds*CAI*Bullydog GT Tuner*Alpine Amp*Boss 6x9's*Boston Acoustic Subs*Terrantula Tweeters*Custom Sub box*Red Led Interior Accents*5% Ultimacool duo tint rear window and doors, 20% front doors*Custom Vinyl Graphics*Demolded*Debadged*Painted drums and calipers*
    Future Mods Include: Custom Interior Hydrographics, Electronic Rollup Toneau Cover, 4.56 Gears, Painted rear bumper

  3. #63

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    Quote Originally Posted by the phantom View Post
    @Kapelusprime hit the nail on the head with some of his thoughts on this. I notice when my AFM kicks in but it is no way annoying. I also noticed that around 6k miles the transmission began shifting a lot less. So I do believe the transmission does "learn" driving style. I originally thought this was BS when I was told it but I now know it to be fact. I will also suggest that the fuel octane does make a difference in how "seamless" the AFM is. I put 87 octane in at one point and did notice the "jerking" that some here speak of. I now put in 93 octane and have noticed no more jerking and have actually gained almost a full 1 mpg. So at 13 cents more a gallon at approximately 25 gallons is $3.25 more per fill up, the math is a no brainer for me to stick with the 93 octane.
    I don't know where you live, but here in St. Louis, premium unleaded in ~$0.30 a gallon more. So for me, I would have to spend ~$7.50 a tank more.

  4. #64
    Legend

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    Sep 2010
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    everett, massachusetts
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    1,462

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    where I live 87 is 3.50 /gal and the 93 is 3.70 / gallon. its 2o cents more per gallon. some up to 25 cents.

    with 93 octane you will see a higher MPG with E85 a much lower MPG ..

    its all about BTU / gallon.. more btu more cost... diesel has the most BTU so you get the best MPG. it also is the most expensive.

    I can see where 93 octane would reduce the engine lag when changing into the low / high power state of operation.

  5. #65

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    Quote Originally Posted by stchman View Post
    I don't know where you live, but here in St. Louis, premium unleaded in ~$0.30 a gallon more. So for me, I would have to spend ~$7.50 a tank more.
    Yeah I apologize I was comparing 87 octane to 91 octane. Here in NY it is .13 difference and the 93 octane is .22 higher than 87. But even still at even $5-$7 dollars difference a tank with an increase of 1 mpg at 25 gallons is 25 miles more a tank and im getting 13 miles to the gallon the math still tells me to buy the premium grade.

  6. #66
    Legend

    Join Date
    Sep 2010
    Location
    everett, massachusetts
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    1,462

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    If your paying .13cents more for 91 octane then using that would be a better way to go. today I happen to notice a mobil gas station 3.65 87 octane 93 octane 3.99 ..........

    I get 19 mpg on the hyway in summer 15 mpg around town. 373 gears..1500 5.3L .

  7. #67

    Default

    Gasoline engines that are designed to burn regular unleaded gasoline(87) will not get better fuel economy by putting premium unleaded(93) into the tank.

    Octane is a combustion inhibitor, not an MPG increaser.

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