make sure your return line back to the tank isn't blocked or cut off...
this would increase fuel pressure and consume more fuel...
check to make sure they are the right injectors...
tune up, new fuel filter, new air filter, check your timing...
any other problems with it?
check thw signals coming from your o2 to make sure its reading properly, also check tire pressures and definately look for a stuck caliper... feel the wheels after a decent drive and see if any feel hot as hell..