The digital computer in my LS states I'm getting 11.8 miles to the gallon, and the way I'm going through gas I believe it. The car seems to be running fine, so I don't know what might be causing it. Does anyone have any ideas? I'm putting it in the shop in two weeks to get the brakes done as well as the power steering looked at. Can they just hook it up to a computer and find out the problem?