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-   -   How much more MPG would you get lowering your car 2 inches? (https://ecomodder.com/forum/showthread.php/how-much-more-mpg-would-you-get-lowering-4141.html)

 blackjackel 07-29-2008 01:34 AM

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)

 taco 07-29-2008 02:32 AM

 Vince-HX 07-29-2008 03:19 AM

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.

 blackjackel 07-29-2008 03:25 AM

Quote:
 Originally Posted by Vince-HX (Post 48660) 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?

 cfg83 07-29-2008 04:52 AM

blackjackel -

Quote:
 Originally Posted by blackjackel (Post 48661) 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

 IvanAndreevich 07-29-2008 01:10 PM

Nevertheless, he has a valid question. Does anyone have any numbers before/after lowering?

 MetroMPG 07-29-2008 01:30 PM

Ivan: not that I'm aware of.

Also, the in/effectiveness of lowering will vary from car to car as well.

 tjts1 07-29-2008 01:31 PM

Alignment is free.
Pelican Technical Article: Home Alignment

 Big Dave 07-29-2008 01:34 PM

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.

 bgd73 07-29-2008 01:37 PM

I didn't notice anything upon my own experiments. Handling, maybe looks...

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