Nothing beats Lucy & Emilia's luck. 
Leg 1: Save by the Salvage Pass.
Leg 2: Around 3 minutes before Adam & Dane's penalty time is up, they made it. 

Leg 3: Sue & Teresa had their fall. 

 Luckily for Lucy & Emilia, it was their 1st time not arriving last. 

Leg 4: Kym & Donna had to get lost in this leg, to save Lucy & Emilia despite being arrested. 

Leg 5+6: 2 Teams had a 4-hour penalty. If they took the penalty too, I think they would beat Ross & Tarryn and even survive the next leg. 

Leg 7: Zero-hour Pit Stop, but if they stayed in France for the whole leg, they could've been 3rd, or they could even potentially beat the 2 teams ahead of them.
Leg 8: Joseph & Grace made a bad move at the detour while Sticky & Sam made a bad move too at the "Australia" trick. With these 2 conditions, Lucy & Emilia were saved again. 

Leg 9: James & Sarah messed up by being late and forgetting to pay the hotel, giving Lucy & Emilia enough time to mess up a bit. 

Leg 10: Unfortunately, nobody else got bad luck, so Lucy & Emilia had to go. 

If they survived Leg 10, Joseph & Grace's money problems in Leg 11 will most likely save them all the way to the F3. 
 I wish they made it to China. 
If only an all-star is possible with Lucy & Emilia... 
 They were very fun to watch.