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 07-29-2008, 01:34 AM #1 (permalink) blackjackel EcoModding Apprentice   Join Date: May 2008 Location: los angeles Posts: 119 Whitey - '05 toyota corolla LE 90 day: 28.91 mpg (US) Thanks: 0 Thanked 7 Times in 2 Posts How much more MPG would you get lowering your car 2 inches? I ran an estimate of 1 MPG gain, and I calculated that it would take me 70 tank fillups to justify a \$100 cost of lowering my car by two inches (springs). If it saves just 2 MPG then the figure would half! How much improvement in FE do you guys think I'll see by lowering my car? Here's my math: 100 gallons x 1MPG saved = 100 miles (saved per 100 gallons spent) 100 miles (saved) / 42 (my current average MPG) = 2.38 (gallons saved per 100 gallons spent) 2.38 gallons (saved) x 4.5 (approximate current cost of gas) = \$10.71 saved per 100 gallons \$100 (approx cost of lowering) / \$10.71 (\$ saved) = 9.337 (amount of times you need to save \$10.71) 9.337 (amount of times) x 100 (gallons) = 933.7 (gallons before the mod pays for itself) 933.7 gallons / 13 gallons (current tank capacity) = 71.823 (tankfuls before the mod pays for itself) __________________