Split the Bill or Split?

So a friend calls you up and invite you out to dinner on Friday night, you accept. If you're anything like me you will give yourself a maximum budget before arriving at the restaurant.
You skip the soft drink and opt for water instead, no appetizer for you, the grilled chicken entree should fill you up.
So far, you have spent $12.99, a $5.99 glass of wine wouldn't hurt.
Meanwhile at the other end of the table, there's that infamous friend who orders the most expensive appetizer, she goes for the steak and shrimp surf and turf, and did I mention drinks...shots anyone?
At the end of the night between the four of you, the bill has come to $150.00, should you split the bill?
As innocent as it may appear there are people who like to take advantage of the occasional group outing. They order the priciest thing on the menu because they know that essentially they don't have to foot the whole bill.
Is it fair for you to pay $37.50 for grilled chicken and a glass of wine? I didn't think so. Keep this in mind the next time you go out, ask for separate checks before placing your order this will save you money and the friend with extravagant taste buds will think twice before ordering the Maine lobster.