Tom,

We're planning to use a DeltaHawk Diesel in our Legacy FG.  Take a look
at http://www.deltahawkengines.com

The 200 HP version of this engine should burn somewhere around 5 to 6
gal/hour (GPH) at 50% - 60% power (100 - 120 HP).  65 gallons at 5.5 GPH
= 11.8 hrs.  If you can get 170 KTAS from 110 HP you'll get your 2000
NM.

Check http://www.cafefoundation.org/aprs/legacy.pdf and find the cruise
data summary sheet.  The last line in the chart shows over 205 KTAS
(12,500 DA) with the engine at 19 inches MP and 2300 RPM burning 9.5
GPH.  I don't think my guestimate above is too far off the mark.

Mark & Lisa Sletten
Legacy FG N828LM
http://web.hometel.com/~legacyfgkit