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J Tinsby is exactly right. As a former ASE certified master tech who owned an import performance shop for 8 years I can tell you first hand how much changing a dirty air filter can help your MPG! The air filter and fuel filter are 2 of the most overlook serviceable items on cars.
And just because it was "supposed" to be done at your service appointment does not mean it was! Ask your tech if it was and to see the old part. Or when you drop it off ask them to keep the old part for inspection when you pick up the car. Most reputable shops check the oil filter for excess engine ware.
I ALWAYS kept the removed service parts (filter, plugs and the like) to show the customer. If they were excessively dirty or worn I would go on to explain to them why they need to replace the part more ofter.
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