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Terrible Gas Mileage on Brand New 4-cylinder Automatic

Discussion in '4 Cylinder' started by rgardine2000, Jun 5, 2013.

  1. Aug 16, 2013 at 5:23 PM
    #61
    Smardt Turbocor

    Smardt Turbocor Older Guy

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    Galen
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    I just purchased a used 1996 Tacoma extra cab with a five speed manuel and 3.4 lit V-6 It needs basic maintenance, but runs just fine. I was surprised that the tires tolerate up to 44 lbs pressure as stated on the tire. I dropped them from 50 lbs to about 37 right now. I may boost them slightly. I shift early, and even skip gears to get into fifth as soon as possible. I love this engine. It is strong even down to 30 -35 mph. At 35 mph I drive it like an automatic. I do not need the 4 liter. I get 26 - 27 mpg and have even gotten 29 mpg. I rarely drive above 62 mpg and slower if conditions permit. I don't know about the engine design on the fours, but this one has four valves per cylinder, double overhead camshaft and I AM IMPRESSED with this older motor! Want gas mileage ? Four valves per cylinder = efficiency, especially at 1900 - 2100 rpm's, fewer cubic inches = more gas mileage.
     
  2. Aug 17, 2013 at 8:36 PM
    #62
    Smardt Turbocor

    Smardt Turbocor Older Guy

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    ===========

    I have two suggestions. First, even when "free wheeling" you still have friction loss. Second, four wheel drive is more complicated. You have more pieces like a front driveline including Constant velocity (cv) joints. That adds weight. Rear wheel drive does not need a three hundred lb transfer case (or whatever it weighs)

    In recent years manufacturers have switched to lighter aluminum cases. Before 1970 most transfer cases were CAST IRON, very strong and twice the weight of aluminum. So guess what happens when you start to carry around a lot of extra weight ?

    And remember it is one thing to drive 4 wheel drive quietly on a smooth road, but once you try wringing it out in the field or desert, you are no longer cruising quietly on the highway at 40 mph. You are typically revving it up in lower (less efficient) gears and THAT uses more fuel. Sand and loose dirt and mud increase friction !!!
     
  3. Aug 17, 2013 at 8:40 PM
    #63
    NOLA ItsNotOva

    NOLA ItsNotOva Well-Known Member

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    Brandon
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    It may say it gets better gas mileage than the V6, but remember, you got the PreRunner which I believe adds the chunckier tires so that relates to more rolling resistance which will drop fuel economy. Also, gas mileages are never what the EPA rates them at.
     
  4. Aug 17, 2013 at 9:48 PM
    #64
    worthywads

    worthywads Well-Known Member

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    Drive 55-65 and anyone can beat the EPA all day long with most vehicles.

    Yet the PreRunner is rated the same as a regular cab 5-lug, and will not achieve anything like a 5-lug that weighs 500lbs less, sits 4 inches lower, and sports 215 passenger tires.

    Driven the same the I4 will get better than the V6, but not as much as Toyota claims.
     
  5. Aug 18, 2013 at 10:46 AM
    #65
    BchLVers

    BchLVers Active Member

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    Randy
    Maryville, TN
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    Your Gas Mileage will get better. 2012 SR5 PreRunner Double Cab 4Cyl with 17,900 miles on it now and consistently over 20
     
  6. Aug 19, 2013 at 5:26 AM
    #66
    rgardine2000

    rgardine2000 [OP] Member

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    I have heard from a number of sources that gas mileage went up after 15k+ miles. I certainly hope that is true. I am only at about 6k right now and am still averaging only about 17 mpg with the 2013 SR5 PreRunner 2.7L. You said you are now averagine over 20 with 17k+ miles. What were you averaging in the first 10K miles??
     
  7. Aug 19, 2013 at 5:41 AM
    #67
    91r100gs

    91r100gs Understand the Voice Within

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    OP
    If max fuel economy is true goal, get yourself a ultragauge or scangague. This will tell you when you are driving efficiently and when you are not. The Ultragauge is $70 right now. It is a great device for the money.
     
  8. Oct 21, 2013 at 9:27 PM
    #68
    peteacher13

    peteacher13 Member

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    I am at 8500 miles and I have been getting pretty consistent 21-22 mpg. My worst tank was 18 and that was towing a 15 foot aluminum boat on a pretty windy/hilly highway.
     
  9. Oct 22, 2013 at 3:37 AM
    #69
    coffeesnob

    coffeesnob Well-Known Member

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    mine is older 2010 but my gas mileage did not go up after 15k miles.
     
  10. Nov 6, 2013 at 3:13 PM
    #70
    merlin3

    merlin3 New Member

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    my 2003 4 cyl. got 14 mpg same as my brothers 2007 v8 tundra 4dr 4x4.now have a 2012 cyl 4x4 reg.cab auto.with 9800 miles on it i am getting 17 mpg.3 mile drive to work with no hills.my company truck is a 2013 fi50 v6 auto 4x4 long bed that truck is getting 16 mpg with 40 miles on it.hard to believe with all this modern technology a 4cylinder toyota truck only gets 17 mpg.
     
  11. Nov 6, 2013 at 4:27 PM
    #71
    jassco

    jassco Well-Known Member

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    Could be troll bait, but I'll bite.

    It sounds like that modern technology got an extra 3mpg for you. Probably driving the same roads/conditions, which is quite impressive. The engine has no chance to heat up in 3 miles to efficiently burn fuel. Taking short trips is very hard on the engine (especially new) and I would expect the mileage you are seeing. You are also getting the sticker rating for city as well which it sounds like you are doing here.

    If you say you get 17mpg and go 3 miles to work it would take you about 3 days to use a gallon of gas. Just going to work it would be almost 2 months to run out of fuel! I wish I had that problem. Take it for some longer highway runs varying the engine speed. It mentions this in the manual. Good luck with it.
     
  12. Nov 6, 2013 at 4:45 PM
    #72
    Yotabilly

    Yotabilly Well-Known Member

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    I have a 2013 2.7 4x4. I get around 15-16 in the city (short, stop and go commute) and 26-27 even 28 mpg on a 500 mile round trip to where I'm from ( mostly 55- 72 mph). Mine has 1900 miles. My first half tank I got 14 mpg.
     
  13. Nov 6, 2013 at 4:53 PM
    #73
    Yotabilly

    Yotabilly Well-Known Member

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    That does help. I'm always watching mine. I got mine on the group buy here.
    [​IMG]
     
  14. Nov 8, 2013 at 6:07 AM
    #74
    BayRanger

    BayRanger Well-Known Member

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    I drive balls to the wall and get 19-21 mpg on my 2012 PreRunner DC i4 with trifold bed cover on it. I've never gotten over 22 mpg even when I try to baby it. My mileage has remained about the same for 30k miles now. I've tried 93 octane fuel also. No difference. Same goes with ethanol-free gas. It doesn't seem to matter. I'm getting 19-21 mpg no matter what I do. Which I'm OK with.
     
  15. Nov 11, 2013 at 5:29 AM
    #75
    Mex713

    Mex713 New Member

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    will i have a 4door 4cyl prerunner and i get about 17mpg but thats because i do drive more on the aggressive side. usually drive 70-90mph on the hwy but when i first got my truck i drove more calm, and still got about 17mpg but i would never go faster then 75 and wouldnt rev the engine higher then 2500rpm while driving. and i live here in houston which is relatively flat with the exception of the highway going up and down alot
     
  16. Nov 20, 2013 at 3:02 PM
    #76
    Enid

    Enid Member

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    Victor
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    Just got a 2014 and same issue. First tank was under 18mpg. 3,500 all highway and best was 22 but average around 20. Almost as bad is it is really underpowered. I have been driving a Toyota RAV4 for six months with 23,000 miles and I loved it. Good power avg 30mpg from the start and the engine is smaller than the new truck.
     
  17. Nov 20, 2013 at 3:22 PM
    #77
    jassco

    jassco Well-Known Member

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    Completely different vehicle. More HP and similar torque specs then the I4 Tacoma all on a FWD/AWD side mounted crossover platform. Rav4 is about 600 to 400 lbs lighter depending on configuration. I always wondered how during the test drives and doing the research people don't notice this? No engine/drive-train changes on these trucks since 2005. Rav4 has had two increases in HP and engines during that time-frame.
     
  18. Nov 21, 2013 at 8:21 AM
    #78
    Enid

    Enid Member

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    I assume all above have the 2.7 4 cylinder. That is what my 2014 has, three weeks old, 3,500 miles. Avg MPG is less than 20. As for the noise all highway avg speed around 60 from Oklahoma to Canada via Nebraska, SD, ND and back through Denver and Kansas. Only one tank was barely over 22.

    If I can get a 6 cylinder that will average 20 mpg seems like it would be worth the swap.

    4 cylinder is seriously under powered compared to the 4 cylinder Toyota Rav4 that I have got in April and have 22,000 mile on.
     
  19. Nov 21, 2013 at 8:32 AM
    #79
    jassco

    jassco Well-Known Member

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    This seems to be a hilly route, so the V6 would fair well. I think people average 17-20 in the V6 which isn't that much of a loss. People should not be buying the 4 cyl to save much gas, but to save on purchase price. I saved about $6k over the v6 with the options I wanted, so for me this worked out best. A new full size can do 18-20mpg if you are looking for a quiet ride and that as well.
     
  20. Nov 21, 2013 at 8:34 AM
    #80
    cdowling

    cdowling Well-Known Member

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    This. :bowdown:
     
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