Those numbers for the VWs are completely unrealistic! If I was only getting 35/42 in my TDI, I would be friggin pissed. Once they are broken in a bit, consumption drops a lot, with a majority of people getting 50+ MPG combined city and highway.
And heck, my nearly 5 year old VR6 GTI gets about 34 MPG on the highway... The Focus is, umm, not quite as good.
Don't waste another minute waiting on parts, or anything else. Just get out there and start racing! You will suck at first, and you will be slower than many other cars, but the only thing you will regret is not starting earlier...