Optimum Speed/RPM on Civic

Discussion in 'Fuel Economy' started by KrazyDawg, Apr 29, 2008.

  1. KrazyDawg

    KrazyDawg Well-Known Member

    I have a 1995 Honda Civic Auto 1.6L VTEC. What speed would give me the best mileage? I've heard anywhere from 45-55 as typical and some rare exceptions at 65. At 65, I get 2500 RPM, 60 MPH = 2400 RPM, 55 MPH = 2200 RPM, 50 MPH = 2000 RPM. I've been slowly accelerating and noticed if you push on the gas pedal too hard, the car will shift up to 3000 RPM (probably when VTEC kicks in). Likewise, less than 2000 RPM doesn't seem ideal if you step on the gas pedal too slowly. I've been trying to keep it between 2000-2500 RPM. Since the car can't use a ScanGauge, I've had to guess at what works.
     
  2. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    Keep the rpm low. Learn the car's shift points. If it shifts at 45 into top gear, get it up to 46 or so and let up on the gas. It'll shift, and then you can get back on it in the higher gear. "fake-shift"

    I use a fairly heavy acceleration rate, but my manual will allow that without downshifting. Since you're driving an auto, just keep it as low as possible. I'd say below 2,500 while accelerating.

    For cruising, the lowest speed that will hold top gear will give you the best numbers. Don't give it enough gas to shift down, but just a touch less than that.

    I've done 34 mpg in my Odyssey (V6 auto) using these ideas, along with neutral-coasting. It's rated 21 combined.
     
  3. JusBringIt

    JusBringIt Be Inspired

    usually a few mph over the lowest speed possible in the highest gear yields the best fuel efficiency. you will probably get the best efficiency at 50 mph, but you can do what one of our members did and just do a few tanks at 50, a few at 55 and a few at 60 and find the trend. i will guess that at 50 mph you get the best efficiency. my car is in top gear at 41/42mph, but my highest efficiency level is at 50mph. this is sometimes listed in the manual.
     
  4. Compaq888

    Compaq888 Well-Known Member

    it's weird that you use a "fairly accelaration rate"...and yet you got 50+mpg..
    can you tell me your shift points for every gear...?

    mine are
    into 2nd at 10mph
    into 3rd at 15mph
    into 4th at 20mph
    into 5th at 25mph
     
  5. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    2nd as soon as possible, probably 2-3 mph
    3rd at 10
    4th at 15-20
    5th at 30+

    I'm very intentional about my acceleration rates. I want to keep the engine in a low-rpm, high-load position. If you keep the rpm that low, you won't really be accelerating very fast anyway. ;)
    This Autospeed article explains.
    I try to keep in that area as much as possible, and when I'm not, the engine is off. Pulse & Glide.
     
  6. Compaq888

    Compaq888 Well-Known Member


    That's very interesting! but i don't think my 4th is going to like 15mph...anything under 20 and it has problems..

    lol I remember when I bought the car...if I put it put it into 5th below 32mph it would barely move and almost stall...

    I replaced the pcv, some hoses that looked bad, air filter, spark plugs, spark plug wires and now i can put it into 5th at 25mph wihout problems..
     
  7. KrazyDawg

    KrazyDawg Well-Known Member

    Since my car is a 4 speed automatic I should only have 3 shift points right (2nd 3rd and 4th)? It seemed like my car had 4 shift points when I felt the car give a little jolt every time it shifted.
     
  8. pumafeet10

    pumafeet10 Well-Known Member

    PaleMelanesian ... How are you getting such good mileage???? Are you using a scangauge? if you are what are your values on the gauge cuz i have a 2000 cx hatch and probably a lighter car and i am def not getting the mileage id like to be getting! i am def doing something wrong. Most of my highway driving is a 19 mile strip from my house to scholl going 65( spped limit) i get up to speed slowly and my tps is low and gph is low ... sorry not trying to thread jack
     
  9. warthog1984

    warthog1984 Well-Known Member

    For an Auto, what's the best acceleration rpm? 2k won't accelerate much at all and the shift doesn't seem to happen until 2600-2700rpm, so vtec-e engages sometimes.

    I'm confused.:confused:
     
  10. PaleMelanesian

    PaleMelanesian Beat the System Staff Member

    Let me restate my numbers. After i posted that, i realize they're a bit low.

    1st: just to get started
    2nd: from <5mph
    3rd: from 10-15
    4th: from 20
    5th: from 30-40, depending on needs and terrain

    For auto, just play with it. keep it as low as possible within the shift ranges built into your car.
     

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