That's easy. EV. I rarely drive more than 200 miles in one day. The added bonus is that I wouldn't have to worry about what the fashionable, politically correct fuel of the day is. The power plant would. Also, power plants convert raw fuel to electricity much more efficiently = less GHG's.
Electric hands down. As stated before, large power companies are better at monitoring and correcting for pollution than most consumers and their individual autos. I rarely go on long road trips, and use my car as a commuter/people mover. Electric would fit the bill nicely.