EcoModder Forum How much more MPG would you get lowering your car 2 inches?

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 07-29-2008, 02:34 AM #1 (permalink) 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) __________________
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 07-29-2008, 03:32 AM #2 (permalink) Master EcoModder   Join Date: Mar 2008 Location: southern, wv Posts: 353 Johnny 5 - '81 Honda Cm400e 90 day: 42.86 mpg (US) Da bike - '06 Honda Shadow Vlx deluxe 90 day: 59.47 mpg (US) Thanks: 18 Thanked 8 Times in 5 Posts how about this lower your car for looks then the change for mpg wont matter as much __________________ .
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my civic has struts and springs and they allow me to corner faster which really helps my EOC on certain parts of my commute.

Btw you also should include the cost of a re-alignment If you decide to mess with your car's suspension.
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Quote:
 Originally Posted by Vince-HX my civic has struts and springs and they allow me to corner faster which really helps my EOC on certain parts of my commute. Btw you also should include the cost of a re-alignment If you decide to mess with your car's suspension.
re-alignment?
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blackjackel -

Quote:
 Originally Posted by blackjackel re-alignment?
Because someone will be disassembling the suspension to install the shorter springs, you will need to get the wheels realigned :

Wheel alignment - Wikipedia, the free encyclopedia

You estimated \$100 for the installation. If your estimate doesn't include alignment, you may need to increase the installation estimate to anywhere from \$150 to \$180 total.

CarloSW2
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 07-29-2008, 02:10 PM #6 (permalink) EcoModding Lurker   Join Date: Jul 2008 Location: Vancouver, BC Posts: 4 Thanks: 0 Thanked 0 Times in 0 Posts Nevertheless, he has a valid question. Does anyone have any numbers before/after lowering?
 07-29-2008, 02:30 PM #7 (permalink) Batman Junior     Join Date: Nov 2007 Location: 1000 Islands, Ontario, Canada Posts: 22,513 Blackfly - '98 Geo Metro Team Metro Last 3: 70.09 mpg (US) MPGiata - '90 Mazda Miata 90 day: 52.71 mpg (US) Even Fancier Metro - '14 Mitsubishi Mirage top spec 90 day: 70.75 mpg (US) Appliance car - '14 Mitsubishi Mirage ES (base) 90 day: 60.16 mpg (US) Thanks: 4,058 Thanked 6,957 Times in 3,602 Posts Ivan: not that I'm aware of. Also, the in/effectiveness of lowering will vary from car to car as well. blackjackel: you should add your vehicle to the garage so everyone knows what kind you're referring to in all your posts (it'll appear under your username). __________________ Project MPGiata! Mods for getting 50+ MPG from a 1990 Miata Honda mods: Ecomodding my \$800 Honda Fit 5-speed beater Mitsu mods: 70 MPG in my ecomodded, dirt cheap, 3-cylinder Mirage. Ecodriving test: Manual vs. automatic transmission MPG showdown EcoModder has launched a forum for the efficient new Mitsubishi Mirage www.MetroMPG.com - fuel efficiency info for Geo Metro owners www.ForkenSwift.com - electric car conversion on a beer budget
 07-29-2008, 02:31 PM #8 (permalink) Banned   Join Date: Feb 2008 Location: california Posts: 1,329 Thanks: 24 Thanked 161 Times in 107 Posts Alignment is free. Pelican Technical Article: Home Alignment
 07-29-2008, 02:34 PM #9 (permalink) Master EcoModder     Join Date: Jan 2008 Location: Steppes of Central Indiana Posts: 1,319 The Red Baron - '00 Ford F-350 XLT 90 day: 27.99 mpg (US) Impala Phase Zero - '96 Chevrolet Impala SS 90 day: 21.03 mpg (US) Thanks: 0 Thanked 186 Times in 127 Posts I lowered my truck 3" in front and 6" in back. In addition I went to smaller tires up front to get another inch. My truck went from 76" tall to 72" tall and I gained 1.0 MPG. The truck also corners much better. __________________ 2000 Ford F-350 SC 4x2 6 Speed Manual 4" Slam 3.08:1 gears and Gear Vendor Overdrive Rubber Conveyor Belt Air Dam
 07-29-2008, 02:37 PM #10 (permalink) Banned   Join Date: Feb 2008 Location: maine Posts: 758 oldscoob - '87 subaru wagon gl/dr 90 day: 47.06 mpg (US) Thanks: 21 Thanked 18 Times in 14 Posts I didn't notice anything upon my own experiments. Handling, maybe looks...