for Crank figures calculator use this
http://www.mk5cortinaestate.co.uk/calculator4.php
Weve managed consistent results in line with the manufacturers claims so I reckon your figures should be accurate as well , the HP values rely heavily on you configuring the correct weight in the profile though , but i guess every car is gonna be different with options etc probably need to get it on a weighbridge.
As for the speedo the app allows GPS and speedo measurement and those seem to match up closely.