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I'd do was gasoline fumes mentioned about dynomat on the wheel wells and floors and add that a piece on the roof will help too. Some NVH can be address by just making things tighter like elhigh did in the interior but also making sure exhaust hangers are tight too....at 2000rpm my Focus exhaust rattles like crazy in the cold. New Weatherstripping for the trunk and doors will help reduce wind and road noise too if yours has seen better days.
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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