Wow - looks like a nice, rust-free VX. Congrats.
In city driving, you're not going to get into lean burn (the VX's secret MPG weapon) nearly as often as when you're cruising on the open road.
For city driving, you'll want to minimize weight & rolling resistance (as Ryland says: tire choice & tire pressure). LRR tires would help.
Above all, driving technique is where you'll find the biggest gains in city driving:
100+ Hypermiling Tips
EDIT: instant MPG feedback is invaluable. You'd have to rig up something like the MPGuino since the VX is not OBD-II.