on my i phone i use a few different apps for hypermiling...
i have a scanguage by the way, i use a very simple "milage calculator" just to give me on the go readings it can switch from MPG to LPHkm which is nice
i also use "Height finder" to see the differences in elevation , i live in the mountains so this is handy when i plan routes and i will know what to expect
i also use "convert units" so i can precicisely calculate volume of tank the difference between a gallon and a litre , also the diff in temps ferenheit and celcius
"weather lite" this app will give you a barometer to tell you the direction of the wind and speed very handy on long trips.
theres just a few but as far as plugging your i phone into your car via OBD2 i wouldent do it , your i phone does so much that you will b distracted if you have a instant readout on your i phone, plus you will eat your battery and you dont always have your phone with you..
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