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Here's how I took a bit of weight out of my 240sx. I was prepping it for a racing class that required the interior and most of the road going equipment, so there's another EASY 100lbs in the car if you're willing to give up things like AC, passenger seats, sound deadening and so on.
Weight with 3/4 tank of gas and as delivered from the factory - 2828lbs
Est. Current Weight - 2608.5
Weight Savings - 219.5
adjustable coilover suspension - 16lb savings over stock suspension setup
remove spare tire - 31lbs
jack/tools - 6lbs
power antenna - 2 lbs
floor mats - 8 lbs
stainless steel header - 15 lbs (savings over cast steel manifolds
S.S. exhaust - 30 lbs (savings over factory thick wall exhaust/resonator/large muffler)
secondary horn - 1.5 lbs
cooling fan/ lightweight pullies - 9.5 lbs
intake - 4 lbs
removed fog lights - 5.5 lbs
removed cruise - 2 lbs
switch to small battery - 16 lbs
Flywheel - 9 (switched to aluminum flywheel)
remove radio/speakers/amp - 8 lbs
gas (¼ tank instead of 3/4) - 56 lbs
Like I said I did this for racing purposes and didn't measure fuel economy. I can tell you that I average 28mpg with my race car ('95 240sx), and 23mpg with daily driver ('96 240sx) when driving both cars normally. One is OBDI vs OBDII so that comparison should be taken with a grain of salt.
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