Totally depends on your speed. I unintentionally put a too wide GP5000 tire onto my narrow, aero front wheel. At 30-31 mph, it was cost me close to 15 watts measured. That is my TT speed (on a recumbent) At 20-24 mph, a 28 mm tire on a 23 mm rim might cost 2-4 watts as a guess, I have never measured it.