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:
Gales put two ferry sailings at risk tonight
Should the Island throw a birthday party for Barry Gibb?
Warning issued over icy roads
High ground could see 4 inches of snow on Saturday night
Mountain Road unlikely to open before Monday
Yellow warning for freezing temperatures tonight
School bangers night called off
AK47 and Uzi handed in to police