Another thread about chain and sprocket, this time for efficiency!

[kaivalagi]

Originally Posted by graman

To get a good mileage you need to record the amount of petrol you put in the tank and mileage and ideally put it into a spreadsheet so it can calculate the last average mpg and the total mpg. Now you have a base for checking data.

Or just use http://www.fuelly.com/ and get a whole bunch of data incl' mpg

As Stu says though who consistently does 60mph or less on dual carriageways with one roundabout in a 30 mile journey? My speeds range from 40 to ~ the speed limit (maybe a few % over ) in parts on A (some dual carriage) and B roads, where I go slow for bendy bits I go faster for straight, safe and empty roads without junctions. I think anyone in these conditions getting 60-65mpg on an SV is doing well, and with one extra tooth on the front I would expect no more than 65-70mpg maximum for better road situations than that...

80mpg, if indeed possible, will not come from "real world" riding IMHO. Is your bike solely used to get to work and back? Do you ride for pleasure too?

I guess there lies the issue. I like most, would rather maintain the higher speed and cheat the revs

Awesome work with 80mpg though!

P.S In Derbyshire/South Yorkshire it is impossible to get really good mpg thanks to the hills.

[mikerj]

Originally Posted by kaivalagi

I get anything from 45 to 60mpg, higher for long runs, lower for evening/weekend blips...I just don't believe 80mpg, 70mpg maybe at a push but not 80mpg...surely not.
%

I can believe it if you aren't doing much start/stop riding. I regularly get over 65mpg even though I tend to cruise at 85ish, simply because for the majority of my commute the bike stays in sixth and it's a long enough trip (30 miles each way) that the engine gets properly warmed up.

An older guy at work gets a regular 75mpg from his pointy with a similar commute, though he's a very steady rider. With taller gearing and steady, long commutes that don't involve city centers etc. I think 80mpg is entirely feasible.