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driving for fuel economy

Discussion in 'Racing and Driving Techniques' started by bcman, Jul 8, 2004.

  1. bcman

    bcman Senior Member

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    Alright everybody, let's get a discussion of driving techniques to improve fuel economy. I'll start it off:
    1. stay in the highest gear possible for your current speed.
    2. consolidate short trips into one, so your engine stays warm.
    3. keep your tires properly inflated.
    4. coast in neutral down hills.
    5. minimize A/C. just run the fan, if you can stand it. if you can't, though, A/C is usually more efficient than open windows at freeway speeds.

    feel free to refute these suggestions, verify them, or add your own.
     
  2. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    i posted this before so ill just quote it from the other thread

    i have an insight... they have a MPG gauge that tells you your current MPG as well as your average for the life of the car as well as one for both of the tripometers... so it makes it pretty easy to tell what methods work and what ones dont



    note: since that was written my highest average for a full tank is 73.2mpg


    higher tire pressures will yeild better mpg (less rolling resistance) i keep the tires on my insight at about 45-50psi


    heres 2 articles from the insight forum i am on, about fuel efficiency (it is specificly for insights... but most of the info should work for any car)

    http://www.insightcentral.net/KB/faq-quicktips.html

    http://www.insightcentral.net/KB/faq-efficiency.html
     
  3. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Sound like good tips to me... I need to get an Insight!
     
  4. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    mike your in texas and dont have all the hills and shit that i have around me
    you should easily see 85+ regularly :thumbsup:
     
  5. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Hmm. Not driving in Houston I wouldn't- 70mph is our minimum speed limit on the highway, not the maximum. My A/C would be on 24/7 too.

    :)
     
  6. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    ok then you would be in the 65mpg area that im in :)
     
  7. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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  8. bcman

    bcman Senior Member

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    good tips E. I've heard the "accelerate briskly" idea before but was never sure what specifically that meant. Are you accelerating at full throttle, or more like 50-70 percent throttle?
     
  9. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    i generally do 50-70% throttle... dont really go 100% full throttle unless im racing
     
  10. Celerity

    Celerity Well-Known Member

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    I find that you can feel what gear the car wants to be in. All you have to do is pay attention to your foot.

    If you are doing 45 mph in 3rd gear, take note of how much throttle you are giving it. Then, upshift,and take note of how much throttle you're giving it.

    You'll see a difference, and of course it changes for uphill travelling.

    For a Honda, and other twin-cam motors (And especially Wankels) More RPM, less throttle. Since I've given my Civic to my dad, he shifts at 3200 rpm most of the time, and then makes up for it with fuel. That's giving him a lot less mpg than I got. Also, I'm driving the MR2 now, and I'm getting 60-80 more miles of a tank than my GF, who gathers inertia by using the supercharger. (Read: More fuel)

    -> Steve
     
  11. JDMilan

    JDMilan Senior Member

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    get a scooter.....
     
  12. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

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    Ah, 100% throttle is one of the most used portions of my fuel map. :lol:
     
  13. Mighty

    Mighty Member

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    Years ago I read an article in Motor Trend or Car and Driver about Civics that got about 100 mpg.

    These were just your basic stock Civic.

    Some university was testing them to see how to get better mileage.

    They noticed two things.

    Wind resistance really hurts gas mileage.

    Engines are more efficient at WOT.

    They rigged the engines so they would cut off at 10mph and then cut back on at 5 mph. They also had them at WOT all the time. I dont really remember how they did it.

    Anyway they got 100 mpg by not going over 10mph and accelerating at WOT every time. So your are right about getting the best mileage by accelerating briskly.
     
  14. preluderjs

    preluderjs Senior Member

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    I always drive at WOT and shift at around 2800 or 3000 right when full boost builds. Should I be shifting right before boost or a little bit into it? my guess would be right before...
     
  15. Sofa King Slow

    Sofa King Slow Member

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    I used to believe that partial throttle acceleration was the key to better MPG. I was getting 41.6 mpg using WOT. However, I got only 36.3 mpg taking it easier on the throttle during accel. Not only does it save gas to use WOT, it's just more fun! :D
     
  16. cycloneb18c3

    cycloneb18c3 Senior Member

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    not boosting a daily driver and running msd 72lb/hr injectors with a 255lph fuel pump.
    dont haul a pile of papers, clothes, system, spare tires, extra people, back seats, stuff like that.
    my moped gets 125 miles to the gallon, and holds 1.5 gallons, and does 65mph(70cc kit, bigger carb,jetted, exhaust)
     
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