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Old 05-01-2009, 05:28 AM   #1 (permalink)
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MPGunio & l/100km?

Hi all,

Does the MPGunio have an option to display l/100km?

Thanks for your time!

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My aim: to achieve 3L/100km.
Best tank @ 65mph: 864.2 miles 69.36MPGus 3.4l/100km
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Old 05-01-2009, 03:23 PM   #2 (permalink)
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I just found this thread today. Haven't even assembled my MPGuino yet, so I can't vouch for it working or not though.
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Old 05-02-2009, 05:48 PM   #3 (permalink)
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Mmm that looks more like km/l rather than l/100km but thanks for the heads-up. I'll try that anyway. I guess I'll be able to update my mpguino in the future, or do I have to buy a new chip each time there's a new version?
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Old 05-02-2009, 06:10 PM   #4 (permalink)
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You can program and re-program the chip as often as you want via USB.
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Old 05-02-2009, 06:39 PM   #5 (permalink)
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Old 05-07-2009, 12:33 AM   #6 (permalink)
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Wouldn't you have to rewrite the entire program? MPG uses the fuel unit as the fixed point, whereas L/100km uses the distance as the fixed reference. So the maths is all different.
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Old 05-07-2009, 05:57 AM   #7 (permalink)
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Its easy to convert between the two actually. Just divide a number, I think, something like 284 by mpg and you've got l/100km. Not difficult.
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Old 05-09-2009, 06:26 AM   #8 (permalink)
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Just got back home and have double checked my figures. It's 282.48 for MPGuk and 235.21 for MPGus.

So, say I've got 5 MPGus and want to convert that to L/100km, I just divide 235.21 by 5 which I get 47 L/100km. If I've got 10 MPGus, using the same formula, I get 23.5 L/100km. So this should be do-able with a couple lines of code, depending on how efficient the program code is.

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