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of course it will. think about it. if the engine is bigger then the mixture of air/fuel needs tyo be increased. if it's increased then it'll consume more gas.
I'm stroked to 5.4L (oooooh and it feels so good) and I get 15.5 mpg combined city/hwy and get 17.5 mpg on pure highway driving twisting off 468 rwhp and 440 rwtq with 3.73's and a T-5. O/D is the niceness......