Exactly my thoughts, I bet you drove a little more on the easy side worrying about the rooftop cargo carrier and therefore increased your mileage by not being so harsh on the peddle 
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2002 Pontiac Gram Am
K&N Air Filter
Mobil1 5W-30 Extended 15K
2 JL Audio 12" Subs Sealed JL Audio Box
Coustic 400 Watt Class D Mono Amp
Pioneer Head Unit 50X4 MP3, WMA, AAC Super Tuner
Polk DB750 6.5" all around
Yankees Suck!!!!!!!!
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