Allright!
I would not have believed it if i hadnt experienced it myself!
Before installing trinity and hemifever custom tune, i filled my truck with 161 liter LPG and drove it to work, same route everyday on cruise control @ 90 km an hour! In the weekend driving around town, groceries etc... All in all got 757 km.. It comes to 4.7 km per liter.
Now with trinity and hemifever tuning i drove same route during the week, but in the weekend i drove more then normal in town and had my foot down for some WOT runs for the sake of data logging
..
Today LPG pushed its last drop through the system and got me @851 km
That is a serious improvement of 94 km.
I also believe i can get it to go 900 km per full tank, because of weather conditions the last couple of days (snow)
All in all im very happy with this device and give my thanks to Sean@hemifever!!