I do, it can be very handy when you make tuning changes to see what impact they have had on your fuel usage.
I use www.Fuelly.com for mine
http://www.fuelly.com/driver/Eddieb
The DR650
BMW R80 with Velorex 762 Sidecar
The Gravel Tourer – Suzuki DL650 Wee-Strom
Jennifer’s DR250X Djebel
It usually just depresses me…
No…My wallet and bank balance does that for me.
When I can’t afford to ride, it has been tracked to excess.
I only track mine on long trips. On the way to kaikoura fully loaded I was getting 17.8 km/l .went up north 2 weeks ago, solo and not so heavy and got 18.5 km/l. My sons 650 got 25km/l on the same trip
I was amazed to get 20.5 km/l (4.88l/100km) the other day on my DR650. Running 16/41 gearing. I was carrying a small amount of luggage, and did a mix of seal and gravel.
With 15/41 gearing I struggle to do better than 18 km/l. Going real silly, I’ve had it as low as 15.