Catch me if you can (MPG)

Discussion in 'VP44 Pump' started by Mopar1973Man, Aug 28, 2011.

  1. Mopar1973Man

    Mopar1973Man Senior Member

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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...
     
  2. ramhunter9

    ramhunter9 Supporting Member

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    Now with the mods I have put in I am down to 17/21
    Still not bad IMO
     
  3. Mopar1973Man

    Mopar1973Man Senior Member

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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...

    [​IMG]

    Still I think I got you with even colder and nasty weather...
     

    Attached Files:

    Last edited: Feb 8, 2012
  4. rambob

    rambob Senior Member

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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.
     
  5. Mopar1973Man

    Mopar1973Man Senior Member

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    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.
     
  6. Stangshcky12

    Stangshcky12 Super Moderator Staff Member

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    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
     
  7. Mopar1973Man

    Mopar1973Man Senior Member

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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. :naughty:

    [​IMG]
     
  8. rambob

    rambob Senior Member

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    if your odometer is off due to larger tires, the hand figures off in what direction?
     
  9. Stangshcky12

    Stangshcky12 Super Moderator Staff Member

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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.
    [​IMG]
    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
     
  10. Rogan68

    Rogan68 Senior Member

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    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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