Welcome!
Good you decided to come out with it...nothing to be ashamed about the 50 figure!
Seen you have accomplished quite a lot. It would have been good to know the details of your work and detailed fuel log - tells a lot. If you have not visited it yet, check out the Garage and other tools on the site.
Is your vehicle a 1.6L or 1.8L. auto or manual? I will have to get impressed more if it is a 1.8L
Start a thread in the success stories section and upload pictures there. Will allow us to see and learn.
Let us keep a target of 60 MPG and see who achieves it first - you or me. (I have a slight advantage here, my vehicle is 1.5L. But what the heck!)