The answer to the question in the headline is 15 mph (in this case), which is pretty damn fast, but if the lawn is good for the day, watch out, because the Honda Mean Mower has an estimated top speed of over 130 mph. Top Gear along with Honda and its British Touring Car Championship partner Team Dynamics have teamed up to create the fastest lawn mower ever. With a 1,000cc engine from a VTR Firestorm, the Mean Mower boasts 109 horsepower and a 0-60 time of just four seconds. Because let’s face it, the only way the smell of fresh cut grass can get any better is by adding 100 mph exhaust fumes to it.