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Discussion Starter · #1 ·
Ok here is what I did.

$4.45 per gal ULSD
15 mpg
30 gal to fill tank
Equals $133.50 to fill tank
@ 15 mpg = 450 miles per tank "MPT"
@16 mpg= 480 MPT
@17 mpg=510 MPT
@18 mpg= 540 MPT

Using 18 mpg ( I am hoping to get this with DPF delete and maybee EGR delete)
That is 90 miles more per tank
and a savings of $26.70 per tank

BADP lists $842.00 for the kit that I want.
$842.00/$26.70 = 31.5 tanks of fuel

So 31.5 tanks of fuel times 450 miles = 14,191 miles to equal the total investment.

The way I see it, as long as I keep my truck for at least 14,191 miles I brake even and then I am in the GREEN!

I am sure to have my truck that long. Heck I just bought it in Feb and I have 4,000 already.

DID anyone see anything wrong in my math?

Thanks BELLYUP!:hyper:
 

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Good math work, only problem i see is that you have a 35 gallon tank and fuel wont be that expensive till next couple weeks. lol. I noticed most of my improvements with the delete is on the hwy. UNLOADED/EMPTY
 

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ohhhh fuel is that expensive up here my man I'm paying 4.40/gal lol... the math looks good but it is a 35 gal tank
 

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Discussion Starter · #4 ·
I have been paying $4.45 per gal for quite a while now.

I only fill 30 gal at a time. That's why I went with 30. :)

Thanks gang.

:popcorn:waiting for code free!"
 

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I figure it up by my average driving mileage of the truck each month. Such as last month, I drove roughly 2500 miles and got 18 mpg average over the whole month, before the mods I was getting 15mpg. With $4.40 for cost of fuel, I saved $122.

If I drove 2500 miles every month, and fuel stayed the same (fat chance it will go down), it would take 16 months to pay off the cost of all my mods, which was around $2000.
 

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Nice job on the payback calcs.

One comment is you will be even way before 14,191 miles. 2 years ago diesel was under $3.00 per gallon, I am now paying $4.59 per gallon. In a couple months it will be over $5.00 per gallon. I know that is lousy news but it helps you payback occur sooner.
 

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noticed the station near my house jumped from $4.59 - $4.79 within 4 days here in Nor Cal Bay area and there's no sign of declining especially this coming driving season. wanna do a DPF delete but worried about the getting caught. Cal is very strict when it comes to emission.

Good Luck on your upgrade and keep us posted on your fuel economy.
 

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maybe we all should go buy new cummins my buddy said i think it was dodge not just his dealer....they will pay anything more then 2.99 a gallon for a year when ya buy a new dodge cummins only dodge so that sounds like good stuff to me but i wont go buy a new one i only have 7200 haha i only get a new one in a few years if i get a mega cab dually but they suppose to stop those in 2009 and make a true 4door long bed
 

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yep, 2.99 gallon for three years with an annual limit of $2,400. Man that could be up to $7,200. I don't know what his source is but my father-in-law has heard fuel will likely be up to $8.00 per gallon in three years!!!
 

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now thats a good idea on dodge behalf i personally think just to keep the diesels selling but not jacking the thread just throwing it out if people didnt know and good jobs on calculating the money numbers i not too worried about it but it makes ya feel better ya will be saving the money the more ya drive
 

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Look at it this way instead.

Find your fuel cost per mile.
(in my area)

$4.10 per gallon/ 13mpg - old mileage=oCPM

$0.3153861 oCPM

$4.10 per gallon/ 16mpg - new mileage=nCPM.

$0.25625 nCPM.

Then, Savings=(oCPM-nCPM)* miles driven in a given period (tank of fuel, month of driving, etc.)

In this case we'll solve for miles driven.

$DPF Delete=(oCPM-nCPM)*miles driven
$1080=(.3153861-.25625)*Miles
$1080=.0591361*Miles

($1080=.0591361*Miles)/.0591361
Miles=18262.956.

So, in 18262.956 miles I will have saved enough fuel to pay for my DPF delete with the savings.

Another interesting thing you can do while figuring CPM is figure tomorrow's fuel price if you're just nuts about spending money to save money.

$5.00 per gallon fuel, 13mpg beginning and 16mpg after DPF delete.

oCPM=.384615
nCPM=.3125

1080=(.384615-.3125)*miles
(1080=.072115*miles)/.072115
Miles=14976.0798.

This way is simpler because you can easily structure and find the amount of miles you'll drive to pay for your mods, AND see how much you'll save over the life of the truck which is much more important.

Steve
 

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I hate to spoil the party on 2.99 a gallon . that is for only 12000 miles a year! need to find the small print!
 
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