I know that the Inland Revenue let you claim 25p / mile for business use and one would assume that this should be representative of the cost of running a motorcycle. However, I found this little gem on the RAC website which concurs with my experience of actual runing costs. [URL]http://www.rac.co.uk/carcare/advice/motorcyclist/Motorcyclerunningcosts.pdf[/URL] So according to the above report you couldn't even run a 125cc bike for 25p / mile. Isn't it about time the Inland Revenue reviewed their rates?