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It depends on the vehicle and gearing. My Jeep is notably overgeared, so going from stock 225/70R16 tires (28.4 inches tall) to my current 245/70R16 tires (29.5 inches tall) actually helped mileage very slightly on the highway, with no noticeable difference around town (yes, the speedo is corrected for the new tires). The gearing improvement was enough to offset the weight penalty, as well as the worse aero from wider tires and the Jeep sitting a 1/2" higher off the ground.
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Call me crazy, but I actually try for mpg with this Jeep:
Typical driving: Back in Rochester for school, driving is 60 - 70% city
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