Iphone fuel economy apps for diesel and gasoline.

Discussion in 'Fuel Economy' started by oldbeaver, Jan 25, 2014.

  1. oldbeaver

    oldbeaver New Member

    Hello all,

    I have checked several IPhone and Android apps, not very practical for me. However, I downloaded and have been testing a very useful and amazing IPhone application, which has a free versión and updates for more information. It outstands among the lot of fuel economy apps available. Haven't seen other of this kind.

    The application gives fuel economy of the car without any connection to it, just based on the horizontal and vertical movement of the car, acceleration and car specs like weight and engine size.

    Besides, the App uploads (optionally) yr performance to its web site, where all journeys info are saved and where driver can review them anytime.

    Main strenghtness of the App are:

    You can use it with gasoline an diesel cars.
    It gives you advice as how to save fuel, and counts $ saved in yr journeys.
    It graphs your driving efficiency in terms of MPG, CO2 emission, brake use, etc.
    You can use it on old cars without the OBDII standars.
    You can test your fuel economy mods using this application.

    The App makes very good use of physics and of the info of the built in GPS of the phone.

    The optional real time fuel economy indicator is very useful to guide you on driving efficiently.

    Weakness:

    You cannot get the application working for a complete tank of fuel, for validation and callibration purposes. At its present stage, only it only gives results of single journeys.

    DriveGain doesn´t overestimate fuel economy, it is more to the opposite side. In my test of a complete tank of fuel, DriveGain understimate my fuel economy by 10% approximately.

    OldBeaver

    Site: www.drivegain.com

    By the way I am using this application in my 1993 Mercedes Benz 300D turbo.

    I ask forum members to test the application, share results and send feedback and suggestions to the authors, in order to improve it.
     
    Last edited: Jan 25, 2014
  2. some_other_dave

    some_other_dave Well-Known Member

    Interesting. If it's only using the on-phone accelerometers for input, I'm not sure how it can do anything better than guess at your fuel economy. It can figure that higher acceleration rates give you worse economy than lower ones, and that lower speed gives better economy than higher speed. It might even, just maybe, be able to guess what gear you are running in. (Hmm, maybe if there was an audio feed it might pick up on engine noise for an RPM estimate?)

    Any MPG numbers shown would be extrapolations based on estimates based on guesses based on approximations based on ... The potential for inaccuracy is immense. Even relative economy figures for higher/lower gear, faster/slower acceleration, etc., will be heavily biased due to the way that the software models fuel consumption.

    I could see an accelerometer-based system helping you get coast-down data to compare aero changes, but I can't see it telling any difference in regular day to day driving. And changes to engine or drivetrain efficiency wouldn't show up at all--any acceleration changes are more likely to be due to the driver's inputs than to engine or transmission changes...

    Unless I'm wrong about where the inputs to the app are coming from, I'm afraid I don't see that much usefulness from it. Sorry.

    -soD
     
  3. RedylC94

    RedylC94 Well-Known Member

    I agree with soD. No way could that be remotely accurate, as described, except occasionally by coincidence..
     

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