I was talking to Na from the Motocross Shop located at the Corner of the Moat by the Triumph Shop the other Day and he showed Me some of His Accessories made for the New CRF250L. Gear Levers, Foot Brake Levers, Sump Guards and Full Exhaust Systems. The One that got My attention was a Performance kit He has. He has it fitted to His own Bike so You can Test it! This is the Same Kit used by Thai Rider Manoch Abdulkaree Who raced the CRF250L for AP Honda in the 2012 Asia Cross Country Rally. See here: https://www.gt-rider.com/thailand-motorcycle-forum/showthread.php/36907-Asia-Cross-Country-Rally Manoch lead the Rally for the Entire Race and was Only beaten in the Final straight Drag to the Finish Line by a Japanese Rider on a Yamaha WR400, Beaten by a Mere 1/2 Second!!! Anyway this Kit Includes Larger Throttle Body, Cam and ECU and is selling for around 19.000 Baht I think? So if You are interested call in an talk to Na. Sounds pretty impressive! Not sure about Fuel Economy though? And You would have to fit the Exhaust System as well to get Maximum gain. Good Luck.