I've got a 3 gl IMS (just released) fuel tank on my TE510 with the fuel injection system. The tank does not appear to have any difference in fabrication to other oversized tanks I've had or seen other than the opening for mounting the fuel pump. Plus if you don't vent a plastic tank thru the fuel cap it will blow up like a ballon during high heat, OEM or aftermarket. I'm sure it is just a matter of time before the R2 has an oversized tank available. What is the available range for R2 in dirt action? It could be worse, I'm happy getting 40-45 mpg in dual sport mode while limiting the motion of the right hand.