Veganbaking.net - The Hows and Whys of Vegan Baking
Veganbaking.net - The Hows and Whys of Vegan Baking
  
When using margarine as a drop-in replacement for butter in recipes, keep in mind that margarine contains more water than butter. This is even more true for tub margarine. In these cases you should consider slightly reducing the water content in your newly-veganized recipe.