well for gas comming out of the exaust is false... its water from condensation.. thats normal.
for the MPG issue, well it depends on how you drive it, is it colder outside? do you let the car warm up alot with the remote? how are the sparkplugs and wires? whats the mileage of the car? alot of things can play in mpg .. like i have a 92 PA supercharged, if i run it VERY smoothly, i CAN achieve 250 miles on a tank of 91 octan, and thats in summer, like here, as of right now, its .15 degrees outside and i let the car warm up for atleast , to give it a chance to the engine and transmission, oh and for my behind who HAS to sit on the cold leather :P
like this time of year witht he warm ups and all, i get about 180 -200 on a full tank.. and i do step a bit more on the gas too...and i got brand new wires and plugs and a new fuel filter.
depends how much fuel economy did you have before your problem surfaced.
tells us more, .. like you mileage, and how you drive it. be honest here here
i drive mine hard sometimes..hehehe
even broke something in a rear drum while making a power slide in a turn.. lost all brakes oil came out.. anways..thats another story
deadring.