I downloaded torque free and checked out how customizable it was then saw how cheap the bluetooth i/f was for it.  I ordered it and 18 hours later it was on my doorstep.  From there I made some custom screnes which the free version is not more than a demo - I bought the 4.95 torque pro and behold 100+ obd2 items and tons of display formats in 5 sizes on 11 screens were customizable in front of me.I run a droid bionic stock in a lapdock display screen - as soon as the 327 was in my honda pilot it figured it out without any work from me.  I had to enter my engine displacement and drive over a scale at a truckstop I know to weigh the vehicle but from there I get 11 pages of digital numeric data, graphs over time, dial gages with bugs (those low / high tabs that stick to the range you run through) along with the vocal anouncement of when your engine is up to temperature and ready to perform and any alarms that come up.Today I moved my 16 mpg to 45 mpg avg just by using a screen with average and instantaneous mileage side by side with engine load.  It turned out running the a/c at a stop sign really uses more gas from the short term fuel trim levels and the engine load demand graph going from 30 at idle to 42 with the ac on, fans on at the radiator, and fans on front/rear seats.  It is so precise you can see the impact of running the headlights as alternator load on the engine.The numeric data is accurate to 1 unit (e.g. 1 percent load on 0-100% or 1 rpm in 0-6500 rpm) - it even showed the extra fuel used to heat the seat.  OBDII even gives you the available fuel in the tank digitally - I discovered it holds back 10% in case you need to limp home.  RPM (tach) is both analog dial and digital numerics with the number (e.g. 741 rpm) in the center of the dial.  You can check speed from gps or from obd2 and check for errors in your speedo due to tire size etc. It also makes good use of the droid x,y,z g force meters and once programmed for your vehicle (you can setup many vehicles and move the BT adapter) it will time your 0-60 (be sure to change to english units as the author appears to come from a metric country) - also change gallons to us imperial gallons.Many of the dials are calculated in the droid or taken from the sensors and gps.  I am running a stock bionic dual proc 1 ghz phone with ample computational power.  It has a logging function and will save every 1, 3, or 5 seconds to an xls or csv file.A friend dropped by last night before smog checking his 2000 yukon - we found 4 error codes and fixed the problems then oblitterated all signs the codes were ever in the ecu - passed smog the today (in CALIFORNIA!) like a charm.Basically the 5 buck s/w and 15 buck h/w gives you a sun diag tool complete with code lookup tables so you know where to check for faults (o2 sensor, fuel injector, fuel rail pressure, etc)With 11 screens you can develop a mileage screen, troubleshooting display, default 6 dial display that comes on the center page.  Using the HDMI output to a large monitor you can use the tiny displays (pro comes with 5 sizes of display)  and they are 100% readable.  other pages will show barometric pressure, coolant temp, battery voltage, and it even works with the key in and the engine stoppedSo if you are droid based a jackson sets you up with a full sun auto analyzer that even can upload data logs and make phone calls.  I'm still reading into the program but it appears it will show you your path on a map and overlay the places you floored the pedal to cross 4 lanes of traffic .I also used it in a 1995 gm 5.7 L V8 TBI which was OBD 1.5 - some sensors were marked out, but open loop closed loop smog was there, as was the codes stored and their meaning (the engine runs 3 secs then stops).  So in 3 days I used it in 3 cars with utter amazement.  I'll buy my mechanic a droid and one of these just so he can maintain the fleet vehicles with ease and save 480 bucks off a sun engine analyzer.  It even shows timing advance/retard during shifts and short term fuel trim/long term fuel trim - a serious diagnostic tool for most 1995-1996 and later vehicles.  I'm dying to try it on a prius.I'm very happy the auto makers standardized on obd2 pretty much across the board from honda, gm, ford, am general, etc.  It's definitely a 5 star system and paired with the bionic app and the sender from fenley amazon's warehouse.  It comes with a 3.5 inch pc cdrom but i'm using the droid and lapdock for ease of readability in the passenger seat.