Yes - I'd be very surprised to see you getting mileage that good with something in tow. The pencil and paper calculation will probably show something different, probably lower.
But - a programmer with a good tune WILL give you better gas mileage, so enjoy what you get.
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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