The Office of Fair Trading is asking for public views on smaller drink measures being sold in pubs.
At present the Island serves spirits in 1/5 gill measures - larger than those served in England and Wales but slightly smaller than in Scotland.
The OFT's now launched a consultation about whether the measures should be changed.
Chief inspector of Trading Standards John Peet says it would also help the industry, which has to buy outsized optics and stamped glasses:
Vintage TT trophies on sale for £5,000
TT merchandise company still owes government over £100k
Manx Care's annual assessment shows £15.6m deficit
House of Keys to sit this morning
Police launch winter car checks campaign
Six new buses to replace 14 year old ones
Record number of seal pups recorded