A good larger displacement V- twin would make lots of torque and get good fuel economy if driven properly. I had a Yamaha virago with a 1000cc engine, 50hp and 50 ft lbs torque, never drove it for fe but remember good mileage. It made so much torque it would go from 25 just off of idle to 115 mph I top gear. Apparently converted to single carb setup (dual to make it sound like a Harley) it will make almost 70 hp. I wonder how aerodynamic a bike is compared to a car
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