Updated code:
accel.setFullResBit(1);
accel.setRangeSetting(8);
..
..
int *x,*y,*z;
accel.readAccel(x,y,z);
xyz[0]=(*x*0.0078);
xyz[1]=(*y*0.0078);
xyz[2]=(*z*0.0078);
(0.0078 = 8/(2^10) - I guess that's correct for scaling 8Gs ? Is it?