Ok, here's where I've tinkered with the model- Engine set at 120hp, prop diameter to 2.99, speed through prop 110 at 2500rpm. Empty weight up to 1588 from 1288. CG- moved the aircraft and fuel tanks back another .2 feet. Putting in actual flight plan fuel, passengers, baggage model performs pretty close to real world for me. Now for the bonus- under Standard, Systems there is a block on the lower left side for FMS/GPS- set both to use modern ARINC424 and you get the version 10 Garmin 430.