TT fans helped generate almost £19 million for the Manx economy this year.
New statistics show significant increases in both visitor numbers and their average spend.
Almost 40,000 people visited for this year's event - that's an increase of 27 per cent from 2010.
The average visitor stayed for 6.5 days - and spent over £650.
MHK Laurence Skelly who has responsibility for Economic Development says research like this is vital:
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