John Macphail, national brand manager of Muffin Break, said one in 40 of the coffees sold through his chain's stores was now made with soy milk.
Muffin Break says it sold
3 million coffees in 2012, of which 70,000 were soy.
In Australia, 7 per cent of coffees were made with soy.
Muffin Break does not charge customers extra for soy milk. Macphail said it cost about 25 per cent more to produce a soy coffee, but his company was absorbing the cost.
Of those who opted for traditional milk at Muffin Break cafes, 70 per cent chose blue top and 30 per cent opted for trim.