Read this:
Understand now very experienced gasifierman with both raw wood and charcoal, Kristijan is saying he can really only ever know by loaded gas fueling each of his different characteristics IC engines.
And unlike me an American able to have far too many engines he must be somewhat careful not to ruin one of his rare engines. The same with all of the daily using guys here on the DOW: Koen Van Looken; Dave in Australia; Matt Ryder; Georgio Pastore; Eddie Ramos; ToneS. They proof their made fuel gas with their engines, using/testing. Gary Gillmore set the examples of this.
The commercial fuels manufacture use test engines to proof their fuels intended to be engine fuels. Not flares. Not lab-rat numbers.
You should too.
Steve Unruh