Fuel Savings Calculator

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Fuel Savings Calculator

Fuel Savings Calculator Results

Based on the parameters you supplied, you'll have to drive 47,500 miles to save $500.00 on gas.

Your Upgrade: dp- tuner 80e tune

You're currently getting 19 mpg and have determined that your upgrade (dp- tuner 80e tune) will result in a 1 mpg improvement, for a total of 20 mpg after the work is done. Gas is currently $4.00 in your area, and the upgrade is going to cost you $500.00.

Geek Stuff: How did we get this number?
Here is how the formula works - from the information you supplied, we have to determine the following:

w = The "cost per mile" to operate your vehicle as-is.
x = The "cost per mile" to operate your vehicle after the ugprade.
y = The difference between (w) and (x) above (your fuel savings).
z = Number of miles you will have to drive until you've saved enough money on gas to pay for the upgrade.

The known variables are the ones you supplied in the form:

g = Your current MPG (you supplied 19)
h = Your expected new MPG after the upgrade (you supplied 20)
f = Cost of a gallon of gas (you supplied $4.00)
e = Cost of the upgrade (you supplied $500.00)

Now we just apply the following formulas (Rounded):

Variable	Formula	Your Input	Value Based on Your Input
w	(f / g)	(4/19)	0.210526315789474
x	(f / h)	(4/20)	0.2
y	(w - x)	(0.210526315789474-0.2)	1.05263157894737E-02
z	(e / y)	(500 / 1.05263157894737E-02)	47,500

Try it Again

So, you think buying that new carburetor, changing gears, or even going so far as putting in a transmission with an overdrive gear is going to save you money on gas? Sure, it will save you money on gas - but will it save you more money than the cost of the upgrade? Probably not! Not any time soon, at least.

I came up with a formula to determine exactly how many miles you'll have to drive after a so-called fuel-economy upgrade to break even in fuel savings and used it to create this calculator. Simply enter your current MPG, the MPG you expect to get after the upgrade, the average price of a gallon of gas in your area, and the cost of the upgrade and the calculator will do the rest. Give it a try!

What is it you want to do?

(ie; Upgrade from TH-350 to 700R4, or install 3.08 gears, etc. Just a brief description so others can read about it later).

What is the cost of this upgrade?

($)

What is the price of a gallon of gas in your area?

($)

Current MPG:

Expected MPG After Upgrade:

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