Not24 You and plenty of other guys think one size fits all mentallity. Another words all engines will run 15% nitro. Yes you can get a ST to run 15% but not at 100% reliabilty. They will suck more fuel and need more weather related tuning and deadstick at odd times. You have a massive thread on a ST2300 and I think half your troubles was stubburness to drop off your beloved 15%...........I just proved this nitro rule to a flyer yesturday with a FOX 50 and his 15% nitro. I told him you have to realize DUKE FOX prided himself on getting the ultimate performance from 0% nitro. The Fox RC long idle bar was invented for these engines. The engine was not reliable in the air. I said lets do 2 things. Put in a fox idle bar and tune on my 5% nitro. The engine never quit again and would idle for ever now. It actually turned better RPM with lower nitro. I'll guarantee if more flyers limited nitro to 10% or lower on a Super Tigre they will love the ST line of engines. I know it is almost impossible to buy 5% nitro from a LHS now a days. The old ST manuals did not recommend up to 15% nitro and the chinese engines are exactly the same as the Italian counterparts. I know I'm wasting my time and preaching to the chior...........