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Gas Mileage Sucks

Discussion in '2nd Gen. Tacomas (2005-2015)' started by Rushbrook, Dec 29, 2011.

  1. Dec 29, 2011 at 7:36 AM
    #1
    Rushbrook

    Rushbrook [OP] Well-Known Member

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    I've been getting 17.9 on the dot for the past year. I have a 70 miles per day commute, and not a lot of city driving. I cruise at 78mph on the interstate, and generally follow speed limits in town. I have very little slowing or traffic on my interstate drive. It's pretty empty at the hours I run it. I'm running Terra Grapplers, factory size, factory recommended pressure.

    So..this week I tried a couple Hipermiling tips I found online. I've got a non-interstate route (for about 10 miles each way of my commute) so I'm running at about 55mph. It's got two hills, so I take it easy on the way up, and coast in neutral on the way down. On the interstate I was running 70mph or less both ways. Part of my interstate commute is mountainous, but I took it easy on the gas. I've tried to keep the rpm's as close to 1500 as I can, regardless of what part of my drive I'm on.


    So I burn 11 gallons of gas and recalculate last night.


    *drumroll*

    15.9

    I've lost 2mpg! What the hell??
     
  2. Dec 29, 2011 at 7:37 AM
    #2
    Rusty 06 4x4

    Rusty 06 4x4 NBHNC

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  3. Dec 29, 2011 at 7:50 AM
    #3
    cc350

    cc350 Buckeye Member

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    Well the Tacoma is far from aerodynamic, and any and all tricks are void. You might squeeze a mile or two from a gallon but that's all. No magic tricks apply. But for it's size and power I'd say I'm happy getting what I do. I'm around 19-20 mpg consistently, but I drive 65 below and posted speed limits and never try to outrun the joker next to me.
     
  4. Dec 29, 2011 at 7:55 AM
    #4
    fishntaco

    fishntaco Well-Known Member

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    Slow down to about 65-70 on the interstate and I bet you gain back 2 or 3 mpg. Around 68 seems to be a good spot for mileage.
     
  5. Dec 29, 2011 at 8:06 AM
    #5
    Rushbrook

    Rushbrook [OP] Well-Known Member

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    I pretty much did that but I'll do it again on the next tank. I didn't go over 70 for 3 days, and two of those I was doing 65 or less. My only guess is that the new route's hills are draining more than I think, but they're only a half mile long at the most. This thing almost makes me wonder if I've picked up a vapor leak somwhere.

    This whole ordeal is the reason I'm looking for a small car for work. My gas bill would drop from $450/mo to under $200. Honestly, the thought of trading it in and getting a diesel Jetta has crossed my mind but I love my truck and don't want to get rid of it. Something's gotta give. I've seen people posting on here that they get 23mpg, and I have no idea how that's possible.
     
  6. Dec 29, 2011 at 8:37 AM
    #6
    charles08tacoma

    charles08tacoma Well-Known Member

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    Wife & I bought a 2012 Jetta TDi w/6 speed manual for her. We love the torque & pull of the turbo. Our worst tank of combined city/hwy is 38.9. She usually averages 41-44 mpg per tank & she's definitely not a hyper miler. She drives 19 miles each way to & from work, mostly highway. I'm now a believer in turbo diesel power. Wish Toyota had one for the Tacoma.
     
  7. Dec 29, 2011 at 8:41 AM
    #7
    Monkeyboy

    Monkeyboy Well-Known Member

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    Don't coast in neutral.

    That trick works with a carbureted engine, or with a dumb ECU. On our trucks, the ECU will use the momentum to drive the engine when it can - which uses little or no fuel - as opposed to idling, which requires fuel.

    This is true, however less so, even with an automatic. Also, consider the computer reads "in neutral and at speed" as a different state than "in gear and at speed" and will manage the engine differently.

    Getting good mileage out of the truck is all about energy management and conservation. If you don't have an instantaneous mileage computer (scanguage, ultraguage, Torque-app, etc) you should get one. It will help you understand and improve efficiency.
     
  8. Dec 29, 2011 at 8:57 AM
    #8
    aaronbuell

    aaronbuell Well-Known Member

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    If I baby my gas pedal on my 2009 access cab 6 speed I can squeeze 20-23 mpg running at 65 on the highway I used Torque for android to verify. The city is another story a 6speed sucks in the city.
     
  9. Dec 29, 2011 at 9:01 AM
    #9
    wmdpowell

    wmdpowell Well-Known Member

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    I get a more accurate read of mpg if I fill at 17 or 18 miles. If I fill up early it seems like it throws off my math (maybe less weight for the 2nd half of the tank makes a difference).

    Under 70 and summer gas make a difference.

    I tried the non ethanol (or treated to reduce the effects of ethanol) this tank. I might help
     
  10. Dec 29, 2011 at 9:01 AM
    #10
    derekabraham

    derekabraham Living vicariously through everybody

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    Cruising at 78 is your problem. Keep the RPMs below 2000. You're also dealing with winter gas right now, which could affect gas mileage. Hills also kill mileage. :(
     
  11. Dec 29, 2011 at 9:17 AM
    #11
    Snowman11

    Snowman11 Supreme Ruler

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    You are right on par with what I get... 78 brings me to barely 18mph but if I keep it at 72-74, I'm still able to get 20mpg.
    60-65mph on a highway is for losers, just stay in the fast lane and move over if you can when someone is coming up fast behind you instead of speeding up to stay in the lane.
    Also leaving a nice gap between the car ahead of you helps a lot except people go around you constantly during the aggressive rush traffic but if you can put up with that, you can stay at 20mpg even at 75...

    AND keep a constant monitor on air pressure, that makes a HUGE difference.
     
  12. Dec 29, 2011 at 9:24 AM
    #12
    BlueT

    BlueT Well-Known Member

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    Speed is what the problem is. I drive under or at speed limit (which is 55 MPH around here) at 50-55 MPH I can crank up up to 28 MPG on my 4x4 V6 DCLB
     
  13. Dec 29, 2011 at 9:28 AM
    #13
    OZ-T

    OZ-T Quite an experience to live in fear , isn't it ?

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  14. Dec 29, 2011 at 9:34 AM
    #14
    rollin904

    rollin904 Well-Known Member

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    Buying a car to save on gas is the dumbest idea I've heard. Calculate the expenses and insurance, you aren't gonna save anything.
     
  15. Dec 29, 2011 at 9:47 AM
    #15
    Thundjet

    Thundjet Well-Known Member

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    It is all about speed, speed, and more speed. Allow me to toss out a couple of examples.

    2002 Ford Crew cab diesel equipped with a very accurate fuel monitoring system. Running at 70 mph on flat ground it will get about 16 mpg unloaded and not towing. Slow down to a steady 55 and it will get 22-23 mpg.

    Ford Focus 5 speed, 70 mph it will get 32 mpg, slow to 55 and it goes up to 40 mpg.

    Can give you many more examples but generally speaking if you want the best fuel mileage you need to slow down to 55 and sometimes even less. It really isnt rocket science.

    Also, anytime you are using your brakes you are wasting energy. Anticipate your stops and try to coast.
     
  16. Dec 29, 2011 at 9:47 AM
    #16
    davelac

    davelac Well-Known Member

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    I'm getting anywhere from 16 to 21 mpg depending on types of roads, weather conditions, traffic etc. It's winter time up here now so the truck tends to warm up a bit in the driveway before I head out.

    I wasn't expecting great mileage with my '11 DCSB V6 4WD coming from a 2WD 4cyl Frontier, but that's why I hang on to my '08 Civic EX Coupe for most of my long trips and weekend excursions. Getting 35 mpg+ normally with it makes it more palatable.
     
  17. Dec 29, 2011 at 9:48 AM
    #17
    derekabraham

    derekabraham Living vicariously through everybody

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    I wouldn't go as far as 55 (unless the posted speed is 55), but even between 75 and 65 there's a significant difference in gas mileage.
     
  18. Dec 29, 2011 at 9:51 AM
    #18
    Manwithoutaplan

    Manwithoutaplan the full Monty

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    how many threads are started that these trucks get crappy gass mileage.
     
  19. Dec 29, 2011 at 10:03 AM
    #19
    scocar

    scocar Scouting the perimeter for weakness

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    Back to square one after the 2001. So...
    As others have said, speed, speed, speed. At higher speeds (above ~60), you are pushing a ton more air. Physics says air resistance is proportional to velocity squared. Consider that in colder temps, air is even more dense.

    Also, what are you carrying in your truck?

    http://www.fueleconomy.gov/feg/driveHabits.shtml

    http://mpgforspeed.com/

    Speed Kills MPG

    Unfortunately, it's true. Your car's gas mileage decreases once it gets past its optimal speed. For most cars, this is around 55-60 mph. This means that every time you go over this speed, you're essentially wasting gas and money - and creating unnecessary greenhouse gases.

    You'd be surprised to learn that a slight decrease in your highway driving speed can significantly reduce your gas consumption, while only adding a few minutes to your travel time.
    How much?

    According to studies backed by the department of energy, the average car will be at its advertised MPG at 55 mph. But as the speed increases:

    - 3% less efficient at 60 mph
    - 8% less efficient at 65 mph
    - 17% less efficient at 70 mph
    - 23% less efficient at 75 mph
    - 28% less efficient at 80 mph

    See the graph below (from fueleconomy.gov):
    [​IMG]
     
  20. Dec 29, 2011 at 10:04 AM
    #20
    scocar

    scocar Scouting the perimeter for weakness

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    Back to square one after the 2001. So...
    As many as there are retards. So a really large amount.
     
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