For instance, which would you say has more fat and calories -- three Big Macs or Uno's Deep Dish Individual Mushroom Pizza? Uno's Web site shows the Deep Dish Individual Mushroom Pizza has 2,070 calories and 159 grams of fat, versus three Big Macs that total 1,620 calories and 87 grams of fat.
"People need to pay attention to serving size. On Uno's Web site, the information says that an individual pizza is actually three servings," said Maxine Siegel of Consumer Reports.
Next up, Wendy's large chili versus Wendy's Chicken and BLT Salad with croutons and honey mustard dressing. The chili only has 330 calories and 9 grams of fat, while the salad has 650 calories and 44 grams of fat.
Finally, which has more fat and calories -- a Krispy Kreme chocolate iced doughnut with sprinkles, or a Dunkin' Donuts corn muffin? The corn muffin has 510 calories and 18 grams of fat -- far more than the doughnut's 270 calories and 12 grams of fat.
"People shouldn't always make the assumption they know the healthier choice. Very often the chain restaurants will have the nutritional information right there, or they can check it out online on the Web site," said Siegel.
Finally, no matter where you eat out, there are a few rules of thumb to follow. If you're ordering a salad, skip the fancy toppings and order the dressing on the side. This is almost 200 calories mostly coming from fat.
You might have savings in your wallet, but certainly not your waistline.