Q: President Joe Biden recently announced an expansion of the use of ethanol added gasoline. Any benefits or drawbacks? It is usually a few cents cheaper, but I wonder if I get as good mileage with the blend. D.J., Burnsville, Minnesota A: A higher alcohol content may lower fuel economy since alcohol contains less energy — lower BTU rating. Bumping the amount of alcohol, mostly made from corn, could impact food prices. Q: Saw the question about rain beading on the windows. I wonder if he goes through the automatic car wash. Most use a spray wax near the end of the cycle and when it does, it co…