Does this GF of yours have a slightly younger sister? 
Personally I don't understand why somebody who is looking to spend so much money on a High Performance car is going to get so caught up on running costs as you seem to be? It just seems odd.
At the end of the day, neither are going to be "cheap".

Personally I don't understand why somebody who is looking to spend so much money on a High Performance car is going to get so caught up on running costs as you seem to be? It just seems odd.
At the end of the day, neither are going to be "cheap".