groan on minimal turns(forward or back3-6mph.Steerfluid pump replaced/rck-pinion

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afer done with replacement, drove off, and a low whine never before heard became evident everytime it automatically shifted. Took it back,immediately. they discovered the pump was defective, so replaced everything including rack & pinion again. Whine is lower, but still present. BUT, noticed now that gas consumption has gone up! Dropped from 20 mph to 15 in 100 miles of street driving, which we never get below 20. Concerned something happened they were not aware of as they were working on the car? The same gas was in the tank before and after the replacements had been done. Very concerned.