J Mac wrote on 02/24/24 at 15:38:13:WOW! That's an almost 20 year-old thread brought back to life. I am totally impressed Riley_N.
Right! I did this type resurrection recently myself. There are some oldies but goodies to keep reviving!
You'll get a lot of answers depending on lots of variable - rider size, driving style, with modifications vs stock, mostly city riding or highway, etc... 50ish is a good ballpark.
Here's some data collection, but it's also subject. You can drill down a bit into the data and glean a few things. Or download the data and crunch some numbers using different weightings, tossing out outliers from the analysis.
https://www.fuelly.com/motorcycle/suzuki/s40_boulevard