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Hello Michael,
The new tires could have worse rolling resistance (make sure to check the air pressure), and/or they may be heavier. Heavier tires has a "double" penalty, since you have to spin them and they are part of the overall weight of the vehicle.
The ethanol could also be part of the mix -- I don't suppose that there is a winter blend down there, but for sure up here in New England, the winter blend of gas gets noticeably worse mileage.
Check out the driving tips!
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