Hi, H_RD2.
I was in Portugal briefly a couple of years ago... well, a few kilometers off the mainland coast:
http://ecomodder.com/forum/showthrea...ing-17941.html
What are your goals with your car? Have you been tracking your fuel economy all along? You're right to start with instrumentation, and focus on driving technique (it's where you'll save the most fuel).
If you can't get your ScanGauge to work because of the MAF issue, you'll need to use an MPGuino, which measures fuel use directly by tapping into an injector signal.
Welcome to the forum!