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Message: <blockquote data-quote="Robert Sayre" data-source="post: 736429" data-attributes="member: 63840">A week ago I removed the air silencer from the air box.  I also drilled a 1.5 inch hole about 1/2 way down on the fender side of the box just for good measure.  My theory was that I wouldn't see or notice any appreciable change to the truck around town, execpt for maybe a slight difference in sound.    I figure a modification like this probably doesn't have as much impact at local/city driving, but would have some effect at sustained highway speed.  This weekend I drove to Michigan and back, 244 miles.  I got 20.6mpg round trip!  Best mileage to date was 19.6.  So the initial evidence shows it might have had an effect.  A few more longer trips are needed to show more convincing proof.  This is the first time in a few years I've driven that far without the family in the truck, so I was a little lighter.  Has anyone else experienced that?  I also was really expecting no difference in local drving, but I think it's more responsive and less sluggish at stoplights and just general driving.  Of course, knowing that I changed something makes me question if I'm really feeling it or if I'm just thinking I do because I know I changed something.  Anybody else notice any changes from this mod?  Anybody have hard evidence (repeated mpg rpts) that show this effect?--Bob</blockquote>