Frontier : Elite 2 Cheats

Press [Shift] and the cursor keys to select
a system other than your intended destination that is extremely
far from your current location. Your request will be refused and
a "xx tons required", "Out of range" message
will appear. Warp to your intended destination, then repeat these
actions to warp again.
Strategy

Buy extra passenger cabins, go to bulletin board and accept
passengers. Then, try to buy another ship. It will be refused, but the difference in price between your ship will be given to you - so try to buy a cheaper ship!

To warp further than possible with Hyberdrive :-

Choose a system really far from you with Shift-cursor keys.
You'll be indicated: nn tons required", "Out of range",
"nn tons required". Now warp to where you really wanted to go, using same trick, and warp again.