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I get about 20 mpg, a little city but mostly driving while keeping the RPMs around 1500. (50mph in 5th gear) I've noticed with all highway (65mph) I can get up to 24-27mpg. (According to readout, hasn't been proved at the pump because I've always mixed it up with some city driving somewhere inbetween.)
19 city, 24-28 highway. You get poor city mileage if you have a lot of traffic and lights. Watch your mpg while you are idling. It drops a tenth every 20 seconds or so.
I was getting 17-19 mpg when I was in the city with 4.10s. But most of my driving is hwy and I average about 22 mpg. Nice IMO but who cares about mpg in a mustang. Thats why I'm going to get a big ignorant redneck diesel with a big blacksmokintwin stack exhaustand still manage to get 25 mpg without a load. [8D]