Hi,

I’m using some section numbers to help people reply to me :-

1.)I’ve been using OBDCarDoctor Pro IOS app V2.0.7.0 for over a week now (APR2018). Very useful, though I’ve some questions, feedback and requests. I’m trying to use it to help me improve my fuel economy, since my car has no mpg gauges. Specifically I’m trying to use the “fuel economizer” screen to help. I’ve already gone from 47 UK MPG to 62 MPG (driving at 62mph max) and would like to go further ideally using your app to help me.

2.) My car is a 2008 SEAT Ibiza 1.9TDI (99bhp turbo diesel, with no DPF as standard). The nearest engine in your database is 130hp though it appears this isn’t important for the fuel economy setting? Also the default engine volumetric efficiency of 0.8 I think has no impact? The engine has a MAF, engine load sensor, and intake manifold pressure sensor, which I believe are the key variables used for the economy calculations. Is my thinking correct? A detailed blog on how fuel economy is worked out for turbo diesels/petrol engines cars would be very useful and welcome. Is that possible in the future?

3A.) On the fuel economizer screen can I please request some improvements. Please allow the y axis of the graphs to be set by the user. User should be able to tap on the y axis and then set the min/max values to be used, or as a second preference allow dynamic scaling. Currently the maximum value is 30L/hr (consumption/flow rate) or 30L/100km. My “economy avg” is typically showing 6.75L/100km (42UK MPG) after a 30 min extra urban journey, so having the axis value being set to 30L/100km is not helpful and only flattens the graphs! I also can’t graph consumption, since the value varies typically from 0.03-0.25-1L/hr which is again very small compared to the fixed value of 30L/hr, so I cannot visually see it.

3B.) Can I please request the ability to display 4 items at the top of the screen instead of the current 3? I’m currently using “consumption” (fuel flow rate), economy avg (1min) & economy avg (journey). Can I also request the ability to graph 4 curves, rather than the current 2 curves? I’m graphing with the last 2 described economy variables which I find helpful.

3C.) I live in the U.K. and would like to use units of MPG (UK gallon), degC and KPa for units. I can’t currently mix the first 2 units. Also in the fuel economizer the units are Gallons/100mile which is a strange unit to work with! Can it please be changed to MPG (UK or USA gallon)?

4.) Why is my reported economy after a regular 30min, 22mile extra urban journey typically 6.75L/100km (42 UK MPG) yet I’ve tank averaged 62 UK MPG (4.56L/100km)? Is the engine power or volumetric efficiency actually being used after all and hence needs changing to get a more realistic fuel economy figure? How can I get the app to show more realistic fuel economy figures?

5.) At the bottom of the dashboard it shows the economizer average across all the journeys for the current day. It was showing an average of 19.75L/100km which is appalling poor and I don’t believe! However on the fuel economizer screen each of the 2 journeys that day had a journey average of around 6.75L/100km. How can this be correct? It’s not a one off result either. Is the dashboard summary actually reporting something completely different?

6.) Can you please do a blog that explains the file format of the text file that you can obtain from the fuel economizer screen. It doesn’t seem to make much sense currently. I’ve MAF, speed and maybe time in seconds, all without units!

I’m hoping you can answer my questions and especially implement my requests for improvements in the fuel economizer screen.

Thanks for your efforts,

Fuel Sipper