You're right about the cost. I worked for McD's during the transition to vege oil, which drove down the profit margin of fried products considerably. Given that

You're right about the cost. I worked for McD's during the transition to vege oil, which drove down the profit margin of fried products considerably. Given that you need a handfull of high gross profit products (fries, coke, coffee, etc.) on the menu to alleviate the burden of low gross profit products (happy meals, anything healthy, etc.) the decision to switch really hurt. Didn't affect the flavour much though. Not a single customer approached us about it at the store I worked in. Though if you took fries from two different batches, each cooked in different oil, and concentrated really hard, you could just make out the difference.