Re: OT: Real world Fuel Costs?

Posted by T_Bone on August 17, 2005 at 05:31:43 from (4.240.39.208):

In Reply to: Re: OT: Real world Diesel Mileage? posted by buickanddeere on August 16, 2005 at 12:47:51:

Hi BD,

Below is a cost comparrision I did for RV.net about 3yrs ago. I think it has good real world numbers for RV use.

This was written about 1/1/03 and reflects my numbers gathered from the model years 2000 to 2002, 7.3 PSD and V10 engines. It appears all current (2004 model) diesels, PSD, CTD and the D-Max have slightly improved in fuel mileage since that time.

Note my savey insight into predicting the current price of fuel... :)

Where did I get my average mpg numbers? I got them from reading numerous mpg threads on many different forums over the past 4yrs and should be a pretty consistant fuel mileage average from reports of people who use miles driven divided by gallons used, a known accurate method for computing fuel mileage.

They did not come from anyone using the factory computer to report fuel mileage as some puters are off quite a bit. How? Example; engines being chipped are known to have extreamly high false mpg numbers because of the chip.

Want to read 99mpg? Reset the trip puter at the top of a mountain then descend the grade without using the fuel pedal and when your close to the bottom of the grade take a puter reading and mpg be up there in no mans world. :)

Why? The fuel is shut off too the engine when the RPM is above idle without the fuel pedal depressed.

Why do some people report extreamly good fuel mileage while other report horrible numbers?
You need to compare apples with apples. Alot has to do with the way the truck is driven. With a light foot and 60mph maximum towing speed will yeild better fuel ecomoney than pulling at 70mph with a heavy foot. A truck pulling 16000GCW will get better fuel mileage than one pulling 20000GCW. A 3:73 axle ratio will get more mpg than a 4:10 ratio. The point is to look at the whole ball park just not the number you want to here or see.

Note: Thease are only ball park figures although I did try to gather realestic numbers to work with. Example: my acutal truck cost less T&L

V10 towing 20,000lbs GCW @ 8mpg average using 5k oil changes for 10,000 total miles
Oil and filter= $16eh= $32net
Fuel $1.50gal average= $1875

PSD towing 20,000lbs GCW @ 12mpg average using 5k oil changes for 10,000 total miles
Oil and filter= $32eh= $64net
Fuel $1.50gal average= $1250

100k= PSD total fuel and oil change cost $13,140
100k= V10 total fuel and oil change cost $19,070

Diesel wins by $5930 per 100k miles
My 2K2 diesel cost $3,450 vs V10 $500= $2950 diff

$5930-$2950= $2,980 diesel savings the first 100k miles.

Assuming fuel prices will stay the same (ya right) $1.50gal for 300k miles a PSD saves $14,840 in fuel.

A V-10 cost for the same truck as spec'd below $30,900 or $.103/mile for 300k miles, I already dicounted the up-front cost of the diesel engine.

I paid $30,900 for my PSD truck so my net cost per mile is $30,900-$14,840= $16,060 or $.0535/mile for 300k miles or 1/2 the V10 cost.

Lets take it one step more. Lets say the average price of fuel, gas and diesel, in the next 5yrs averages $2.10/gal, from 5yrs to 10yrs averages $3.10/gal, using 30k total miles/yr at 70% empty and 30% towing 20,000lbs GCW, V10 8mpg towing 14mpg empty, PSD 12mpg towing 20mpg empty, then we get:

V10= empty fuel cost= $39,000
Towing fuel cost= $29,251 or $68,252 gross fuel cost for 10yrs

PSD= empty fuel cost= $27,300
Towing fuel cost= $19,500 or $46,800 gross fuel cost for 10yrs

PSD saves $21,415 in fuel cost over a V10

Have fun in your hunt for the new TV :)

I have not even considered how a PSD will out pull a V10 towing 20,000lbs as to make a V10 last 300k miles one would have to tow at 60% of rated HP RPM.

The diesel wins hands down in cost and towing power no matter how you run the numbers.

T_Bone

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