Basically 10% will just make your engine run a bit hotter and put out less power. So it will be easier to drive, but obviously that is only by virtue of less speed. Yes you will be able to notice a definate decrease in power.
actually 10% isnt as bad as I thought it would be..
wheelnut I think you got it backwards.. less nitro and more oil = cooler running engine.. unless you lean it out too much trying to make up for the loss of power..