I have about 400 miles on my 450i, mostly street, I purchased it as a company vehicle, with the thought that it would help us on larger boundary parcel surveys, when in practice, we have found that we use in on the street much more, to huff our warning signs and cones along the street as we work, I can drive up to 10 miles on any street with a speed limit 40mph or less, and beyond that, I can trailer it to job sites and have a 2 mile radius from the job site
I find that it cruises right up to 47mph with little effort, when the governor takes over, Ive had it coast up to 48 or 49 on steep downhills, never 50, even fully loaded between myself, 300, my field help has 5 inches in height over me weighs 325, + survey equipment 75-100 lbs, and towing a log splitter 1000 lbs? I can maintain 35mph on grades as steep as 18%, and it goes off road nicely when the need had arisen.