I rode the Vincent 7,000 miles last year . Because of the worn out carbs, it was burning an Imperial gallon every 35 miles.
7000/ 35 =200 gallons.
I use midgrade gas which costs 1.40 per litre , 4.55 litres per imp. Gallon, so gas costs $6.37 per Imperial gallon.
200 gallons is $1274
Had the bike out on a 200 mile run today and it is getting spot on 60 MPG running around 65 -70 MPH.
So if I ride 7,000 miles this year at 60 MPG, the consumption will be 117 gallons of gas, which costs $ 743.
The fuel savings is $531 for one riding season. The carbs were under $400 shipped.
Glen