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Catch me if you can (MPG)


This is a discussion on Catch me if you can (MPG) within the VP44 Pump forums, part of the Dodge Ram Cummins Diesel Forum category!
Here you go... Gasoline 116,090 BTU per gallon / 3.919 = 29,622 BTU per dollar Diesel 133,000 BTU per gallon ...


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Old 09-13-2011, 07:05 PM   #21 (permalink)
 
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Here you go...

Gasoline 116,090 BTU per gallon / 3.919 = 29,622 BTU per dollar

Diesel 133,000 BTU per gallon / 4.099 = 32,446 BTU per dollar

Diesel still is a better deal...

As for the rise... RV275 injectors, Edge Comp (5x5), and learning how to drive again...


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Old 02-08-2012, 03:09 PM   #22 (permalink)
 
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Now with the mods I have put in I am down to 17/21
Still not bad IMO
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Old 02-08-2012, 03:52 PM   #23 (permalink)
 
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Knowing you've got larger tires how are you getting your distance number correct?

Percentage offset or using a GPS?

With weather at about -2*F for starting low and +22*F for a high and travel all the way to Ontario, OR get some stuff and head home. With my list of mods and running my 265/75 R16's I pulled... Cmg is my round trip... Tmg was from Ontario, OR to home...



Still I think I got you with even colder and nasty weather...
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Old 02-08-2012, 04:26 PM   #24 (permalink)
 
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I want to get one of those gauges.
would probably pay for it self rather quickly if you (I) could learn to drive from it.


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Old 02-08-2012, 08:36 PM   #25 (permalink)
 
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Originally Posted by rambob View Post
I want to get one of those gauges.
would probably pay for it self rather quickly if you (I) could learn to drive from it.
Worth every penny... Yes you'll learn that your driving style, mods, tuning, etc. all have a effect on MPG's. Funnier yet the ScanGauge II is more accurate than hand math because the SGII is calibrated and corrected for both speed / distance and fuel flow with my mods. Where my speedometer is off by 0.5 MPH so the odometer is off by about 20-30 miles per tank.


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Old 02-09-2012, 01:07 AM   #26 (permalink)
 
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Originally Posted by Mopar1973Man View Post
Here you go...

Gasoline 116,090 BTU per gallon / 3.919 = 29,622 BTU per dollar

Diesel 133,000 BTU per gallon / 4.099 = 32,446 BTU per dollar

Diesel still is a better deal...
This caught my attention so I looked into a little bit more. Pressure and temperatures a big variables on both fluids. I double checked the NIST values with the AFDC values, gasoline Is 116,090 btu and diesel is 128,450 btu
The current national average of gasoline is $3.483 so 33,330.4622 btu/dollar
Average of diesel is $3.888 a gallon so 33,037.5514 btu/gal

Unfortunatley the government will always tax diesel fuel so it's price per btu is similar/ less efficient then gasoline


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Old 02-09-2012, 10:07 AM   #27 (permalink)
 
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Careful with the diesel BTU value it varies in repect to cetane level...

Using ASTM testing scale for my local summer and winter fuels... Lower the cetane the more BTU's.



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Old 02-09-2012, 10:21 AM   #28 (permalink)
 
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if your odometer is off due to larger tires, the hand figures off in what direction?


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Old 02-09-2012, 02:19 PM   #29 (permalink)
 
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Maybe with your additives, in that case you have to consider * API gravity, distillation range, sulfur content, stability and flash point to determine BTU content since cetane isn't a measure of fuel quality.
ASTM is not the standard for energy properties NIST is. ASTM did set the standard cetane level at 40 in north America (which is the minimum level recommended by almost all diesel engine manf.) using different cetane levels then the manufacturers doesnt always result in better efficiency. Any graphs I've ever seen no. 2 diesels performance and efficiency both plateau at 55.

Hopefully this works, this is from the dept of energy and matches NIST
http://www.afdc.energy.gov/afdc/progs/fuel_compare.php
Do you have a link for that graph or the information. I'd like to look into it more


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Old 02-09-2012, 02:49 PM   #30 (permalink)
 
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Originally Posted by Mopar1973Man View Post
Knowing you've got larger tires how are you getting your distance number correct?

Percentage offset or using a GPS?.

Before I got the Edge Juice w/Attitude, I noticed that my larger tires vs speedo wasn't linear.. sub 30-35mph, the speedo was on the money with the gps. as I went faster, the speedo started to lag.


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