GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER

how to up my MPG

Discussion in 'Performance & Fuel' started by Andy_Panda, Feb 11, 2013.

Thread Status:
Not open for further replies.
  1. steved

    steved Former Member

    Joined:
    Apr 18, 2012
    Messages:
    291
    Likes Received:
    2

    Very well could be tires...not all tires have the same rolling resistance, even in the same size. I saw at least a 2mpg difference between the Pirellis and the Revo IIs I ran on my last truck...they were both LT265x70R17 load range E. The Revos really rolled hard, and it showed in mileage.
    #41
  2. dobey

    dobey Member

    Joined:
    Dec 1, 2010
    Messages:
    280
    Likes Received:
    1
    That post wasn't a statement he made. It was something he copied off a web site. Interestingly, the owner's name is misspelled, in that supposed "endorsement" from him. I wonder if he even knows it exists.
    #42
  3. phoebeisis

    phoebeisis New Member

    Joined:
    Jun 14, 2006
    Messages:
    1,613
    Likes Received:
    9
    1) Right Tires wheels-all season not all terrain-unless you need All terrain-and keep the pressure to at least door panel pressure-closer to side wall max is even better-don't put bigger wider taller heavier tires and wheels on-
    2)Don't carry extra weight
    3) Glide up to red lights and other stops- stay off brakes-just gas up to speed-then get off gas in city driving-our GM transmissions glide forever-they act like they are in N when you completely lift off the gas-
    Mine doesn't downshift and engine brake until I glide down to 24-25 mph-
    GM designed them to get decent city mpg-to glide
    4) In tune etc-maybe occasionally use techron or some fuel system cleaner occasionally
    5) Use CC- AND DROP HY SPEED A LITTLE-Slight decrease in hy speeds- say 65 mph vs 71 mph saves maybe 2 mpg-
    on cruise control- all of our 96 on trucks(2wd subtract 1 mpg for 4x4) will get pretty close to 20 mpg at 65 mph-latest 5.3 would get close to 25 mpg with CC set to 65 mph or so-minivan mpg

    Some else mentioned the cruise control-VERY VERY FEW drivers can beat CC mpg-and it wears you out to try-set that CC-let GM engineers do the work.
    #43
  4. dobey

    dobey Member

    Joined:
    Dec 1, 2010
    Messages:
    280
    Likes Received:
    1
    Don't inflate to sidewall max unless you are placing max load on those tires you're inflating. You might get a very tiny increase in MPG with no load, at max pressure, but your tires will wear unevenly, so you'll have to buy new ones sooner. Keep the tires at an inflation pressure where they wear evenly across the tread, and you'll get the best MPG and best traction, and your tires will last longer. Plus you won't run the risk of heat buildup in the tire from increased flexing of the sidewall, that can lead to critical failure at the worst time. Buying a harder compound "low rolling resistance" tire will also help increase MPG, with a slight compromise in traction.
    #44
  5. phoebeisis

    phoebeisis New Member

    Joined:
    Jun 14, 2006
    Messages:
    1,613
    Likes Received:
    9
    Dobey
    Yeah I wouldn't got sidewall max-except big load
    But closer to sidewall max is better than putting them at door panel
    because they all lose pressure-few lbs a month
    and most folks won't check too often
    So shading toward sidewall max-maybe exactly between door panel and sidewall max-
    will keep you above door panel for a month or two

    BIG ASIDE- do new tire take a while for the bead to seat and seal well
    Just got cheap Hnakooks-short of $$-they were about $360 installed-walmart-for 3

    For the 1st week or so-they lost maybe 1-2 lbs a day
    last week or so-they have held steady-no pressure drop to speak of
    Is this typical-bead seats seals over a week or two?
    Thanks
    Charlie
    #45
  6. dobey

    dobey Member

    Joined:
    Dec 1, 2010
    Messages:
    280
    Likes Received:
    1
    Tires shouldn't lose that much pressure, and certainly not that quickly. I bought new wheels and tires for my truck back in May, and they've pretty much stayed at pressure since then. Maybe 1-3 PSI cold pressure was lost over the last 3 months, total, and I just had to put a tiny bit of air back in the other day. I bought them from TireRack and they came mounted/balanced/inflated. They certainly do not lose 1-2 PSI a day. If you are losing that much pressure, then either the bead isn't seated properly, or the wheels could be damaged (which could prevent a complete seal).

    And always measure tire pressure cold (before driving anywhere, or after several hours of sitting unmoved).
    #46
  7. phoebeisis

    phoebeisis New Member

    Joined:
    Jun 14, 2006
    Messages:
    1,613
    Likes Received:
    9
    Dobey
    Yeah-it was odd- 1st few days they lost 1-2 lbs per day or two days-same temp and when cold

    But after 1 week-pressure loss stopped??
    Yeah I found that odd-I put 41 all the way around-checked after they were cool-40 psi

    Two days later-35-36 psi-when cold
    Refilled to 40psi(actually 41 psi but pumping the air heats it a bit-so pressure drops naturally as temp drops)
    3 days later 35 and 36psi again-dropped 3-4 psi
    But now- 10 days later-still at same 35-36 psi??
    Yeah-odd-but they are cheap tires-can't remember this ever happening-but I follow tire pressure more closely now-who knows?
    You are Right always check in the am-dead cold-and air temp can make a big difference- bright sunlight on black tires-makes a difference also-so early AM is best.
    We alo pick up 2-3 psi going from sea level NOLA to Flagstaff AZ- 7000 FT

    Folks waste lots of gas because they run well under door panel pressure-lotta folks rarely check tire pressure-
    #47
  8. Parkrat

    Parkrat New Member

    Joined:
    May 28, 2013
    Messages:
    37
    Likes Received:
    0
    Im sorry i'll correct that, the supposed opinion from the "gurls" about mpg gains is just that, opinion never tested, sum have it sum don't.
    #48
  9. dobey

    dobey Member

    Joined:
    Dec 1, 2010
    Messages:
    280
    Likes Received:
    1
    Real scientific post. Thanks for all that overwhelming information in favor of your view. It really proves your point.
    #49
  10. Parkrat

    Parkrat New Member

    Joined:
    May 28, 2013
    Messages:
    37
    Likes Received:
    0
    My scientific, your scientific, mine was overwhelming for me, but yours is too.
    #50
  11. dobey

    dobey Member

    Joined:
    Dec 1, 2010
    Messages:
    280
    Likes Received:
    1
    And you're still acting like a child. Just because you believe something, doesn't make it true. I don't care what you're dumping in your tank, there's no way in hell you're getting 25 MPG from a petrol-fueled 4.8L vortec in a 5600 lb truck, in the city. Hell, I don't even buy that you were getting 18 MPG in the city before you dumped some junk in your fuel tank. Fuel system cleaner doesn't work that way.

    Either you're running on smaller tires and haven't fixed the ECM to account for the difference, or your math is just plain wrong.
    #51
  12. Parkrat

    Parkrat New Member

    Joined:
    May 28, 2013
    Messages:
    37
    Likes Received:
    0
    Im right and so is my math, your just stuck in the old days when it couldn't be done, those days are over. I'll enjoy my mpg and let you pay through the nose for yours.
    #52
  13. donl

    donl New Member

    Joined:
    Apr 24, 2009
    Messages:
    130
    Likes Received:
    0
    You should contact GM. They would pay handsomely for your secret.
    #53
  14. Parkrat

    Parkrat New Member

    Joined:
    May 28, 2013
    Messages:
    37
    Likes Received:
    0
    Its no secret, real popular around here, and just so you know im on tank # 5, most of the time you will get mpg gains for the first 6 tanks and thats it so im expecting a little better mpg on this tank, ill post that in a week or so.
    #54
  15. mfleetwood

    mfleetwood Moderator

    Joined:
    Jul 6, 2010
    Messages:
    7,213
    Likes Received:
    11
    Great discussion topic....
    #55
  16. Parkrat

    Parkrat New Member

    Joined:
    May 28, 2013
    Messages:
    37
    Likes Received:
    0
    I was busy doing some home renos so I didn't have much time to drive the truck but I did run it down to a little over half a tank, I had 378 kms on it so I topped it up and it took 43.5 liters, that's 11.5 liters per 100 kms or 24.48 mpg imp so it looks like that's all im going to get, still not bad for a big ride in city only.
    #56
  17. dobey

    dobey Member

    Joined:
    Dec 1, 2010
    Messages:
    280
    Likes Received:
    1
    Please stop using British gallons and miles. They are completely irrelevant and only serve to inflate your claims, as the overwhelming majority of people on this forum are from the US, particularly those who were participating in this thread before you jumped in with wild claims.

    If those numbers are actually true, then that's 20 MPG US, not the 25 you keep claiming. 20 MPG is slightly more believable, but not entirely so as city only, at least, not without a fairly stripped down truck.
    #57
  18. stchman

    stchman New Member

    Joined:
    Oct 31, 2012
    Messages:
    1,035
    Likes Received:
    1
    According to @Parkrat numbers:

    43.5 L = 11.49 Gal US
    378 Km = 234.88 Miles

    Fuel economy:

    234.88 Miles / 11.49 Gal = 20.44 MPG

    So yes, @Parkrat math SUCKS.

    Still 20.44MPG is pretty good, but still an unbelievable number for city only driving. My 5.3L Silverado with ALL highway driving will easily achieve 20.44 MPG.

    If @Parkrat was using Imperial Gallons, that figure would be 9.57 Imperial Gallons used and that would give him 24.55 MPG.

    @Parkrat needs to know that 1.0 Imperial Gallon is 1.2 US Gallons.

    The only way to achieve better MPGs with keeping everything the same (engine, transmission, gears, weight, etc.) is to put in fuel with more energy. I don't believe that dumping some additive in your gas tank will result is infusing the gasoline with more energy. If anything additives are usually not flammable and will detract from the fuel's energy.
    #58
  19. Parkrat

    Parkrat New Member

    Joined:
    May 28, 2013
    Messages:
    37
    Likes Received:
    0
    Bobey, go curl your hair.

    - - - Updated - - -

    Im Canadian and I use liters and imp gallons so my numbers are right, 11.5 liters per 100 kms or 24.48 mpg imp.
    #59
  20. mfleetwood

    mfleetwood Moderator

    Joined:
    Jul 6, 2010
    Messages:
    7,213
    Likes Received:
    11
    Is it so tough to get your facts and opinions out without it starting to get nasty? If this thread starts going down that road again, it'll be closed :)
    #60
    1 person likes this.
Thread Status:
Not open for further replies.

Share This Page