I put on a Givi rear rack with a 46 liter topcase,soft saddle bags across rear seat & duffel bag across rear seat .This setup was for my last 800 mile camping trip. No problem with any wind . Got 46 - 50 mpg going 55-75 mph. Coming home 75 miles was down hill thatís when I got 50mpg. Soft Saddle are real easy to put on & take off & a lot cheaper,mine even have a rain cover. Iíve never had a problem with a topcase on any bike .