Recently I watched the 1991 Texaco/Havoline 200 at Road America. The race was won by Michael Andretti due to a better pit stop strategy, although Al Unser jr. was faster for most of the race. The latter even overtook Andretti three teams.
This race showed exactly what mid-race refuelling does to the racing: you don't have to be the fastest or best driver of the day to win. You just need a team figuring out the best possible pit stop strategy. In a racing series that is considered as a drivers' championship in the first place, there should be no place for mid-race refuelling. Besides, in my opinion this equally counts for tyre changes.