[2strokebloke]

Any car with a front mounted engine will want to understeer. However, that FWD will have more understeer than RR, is somewhat missleading. Once again I'll note that when Toyota's first front driver, the Corolla-Tercel was introduced, test drivers were impressed by the fact that it exhibited less understeer than any of Toyota's other cars (which were all rear wheel drive at this point in time) Generally cars come from the factory "tuned" for understeer, because this supposedly feels "safer" to drivers (remeber the Corvair?).
It's not that FWD has to be so heavy on it's helping of understeer, it's that companies want it to be.