Oh yeah, extra people in your car will CERTAINLY make a difference.
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The amount of fuel in your tank will also make a slight difference in your acceleration. Take for example a Prelude and a Prelude SH. The only difference is the ATTS in the SH, which enhances it's handling, but also adds about 200 lbs to it's total weight. The regular Prelude out-accelerates the SH model by a couple of tenths of a second to 60 and in the 1/4 mile.
