A good question.
1. It seems to me that it is generally accepted that the EMTLU is not part of the original move, so you can use your good going distance to make contact, then use the extra 80p to enter the terrain.
2. However, when a move is required to end lined up with enemy, it is generally accepted that only the end-state after the EMTLU is relevant.
2 appears to be intended by the rules as written.
1 can't really be deduced either way from the rules as written. When I originally read the rules I thought the opposite was intended, i.e. only the end-state after the EMTLU was relevant to deciding your allowable move distance.
Lawrence Greaves