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Fuel Consumption While Towing (What's L/h?)

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  • #1

    Fuel Consumption While Towing (What's L/h?)

    Kind of a specific question but I'm hoping someone here will know. Guest ?

    I monitored "Engine Fuel Flow" using ForScan Lite during my recent trip. The fuel rate was measured in "L/h". What does that mean? I'm guessing litres-per-hour (based on a list of acronyms and abbreviations from https://www.autoequipment.com.au/ima...0REFERENCE.pdf ) but I don't think that's right--doesn't make sense based on what I was seeing on the screen.

    Example measurements (flat, straight road with no one around me and no significant wind from any direction):

    45 mph: .24 L/h
    55 mph: .32 L/h
    65 mph: .48 L/h

    No way the truck is only consuming .24 liters per hour (I wish).

    What I want to do is convert these measurements into a MPG value.

    A Ford Superduty forum is obviously a better place to ask this question...so thanks in advance for letting me ask here first.

    Howard
    Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

    Howard & Francine
    2017 Ford F-350 DRW, '19 315RLTSPlus
    Tags: None
  • #2
    Off topic a little but:
    I ran a Scangage in my 2005 Silverado Duramax and played extensively with mpg calculations.
    I got it accurate enough that I quit calculating mpg via distance vs gallons to fill up.
    The most enlightening part of the data was the boost readings. I learned a lot about the best method to climb hills. I had previously tried to stay in 6th gear on climbs but quickly learned that 5th gear with a little more rpm's yielded betterr mileage as well as better EGT's.
    2021 Reflection 337RLS, 2021 Silverado 3500HD 6.6 gas. Nellie the wonder boxer
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    • #3
      Originally posted by familytruckster4 View Post
      Off topic a little but:
      I ran a Scangage in my 2005 Silverado Duramax and played extensively with mpg calculations.
      I got it accurate enough that I quit calculating mpg via distance vs gallons to fill up.
      The most enlightening part of the data was the boost readings. I learned a lot about the best method to climb hills. I had previously tried to stay in 6th gear on climbs but quickly learned that 5th gear with a little more rpm's yielded betterr mileage as well as better EGT's.
      Yep--exactly what I'm attempting to learn how to do. Just not sure how to use ForScan and it's capabilities to extract and interpret the information. Not even sure I'm looking at the right data. :(
      Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

      Howard & Francine
      2017 Ford F-350 DRW, '19 315RLTSPlus

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      • #4
        All of that calculating had the added benefit of keeping me occupied on long stretches of road outside the cities. I got to the point where I could really rack up the mpg in the hills when there wasnt much traffic. Most of the time folks get testy when your only doing 50 when you hit the top and 70 when you hit the bottom
        2021 Reflection 337RLS, 2021 Silverado 3500HD 6.6 gas. Nellie the wonder boxer

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        • #5
          I installed a boost gauge and EGT gauge in my truck back when I was pulling around a 30' enclosed car hauler for a 66' Impala I used to have. Learning how to keep those gauges as low as possible for the work being done translated into some very impressive MPG rates. Also having an old, but very well maintained, non-emissions diesel seems to get better mileage than its newer counterparts.
          I also second the use of a Scanguage, once configured and calibrated to your vehicle it is very accurate.
          2021 Reflection 278BH
          2002 GMC 2500HD
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          • #6
            Originally posted by howson View Post
            Kind of a specific question but I'm hoping someone here will know. Guest ?

            I monitored "Engine Fuel Flow" using ForScan Lite during my recent trip. The fuel rate was measured in "L/h". What does that mean? I'm guessing litres-per-hour (based on a list of acronyms and abbreviations from https://www.autoequipment.com.au/ima...0REFERENCE.pdf ) but I don't think that's right--doesn't make sense based on what I was seeing on the screen.

            Example measurements (flat, straight road with no one around me and no significant wind from any direction):

            45 mph: .24 L/h
            55 mph: .32 L/h
            65 mph: .48 L/h

            No way the truck is only consuming .24 liters per hour (I wish).

            What I want to do is convert these measurements into a MPG value.

            A Ford Superduty forum is obviously a better place to ask this question...so thanks in advance for letting me ask here first.

            Howard
            Are you sure the “h” isn’t a “k”?

            Edit: That wouldn’t make sense either.
            John & Kathy
            2014 Reflection 303RLS
            2014 F250 SC SB 6.2

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            • #7
              Howard,

              It looks like it could be liters per hour but sometimes what is madeI public can be highly filtered or even have a description that is less than intuitive. For instance this could be on a per cylinder basis. See if that makes more sense. Camping right now in the cold and rain and loving it.
              So using my phone is a little different. Lol

              Jim

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              • #8
                Fumbling with my phone, per cyl would be about .5 gal/h so this does not add up. When benchmarking, we ran into this many times and pulled the raw signals in with specialized equipment. Scaled the high speed signals and named them. So in short, some of these signals that are Public are not worth much.

                Jim
                Last edited by Guest; 04-08-2022, 12:19 PM.

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                • #9
                  The tool may also be pulling in the wrong can address. Or the number may need to be scaled.
                  Or it could be fuel flow per injection event? There could be many....like 10 per cyl or more.
                  Try different methods and see what correlates.
                  Jim
                  Last edited by Guest; 04-08-2022, 10:27 AM.
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                  • #10
                    Originally posted by howson View Post
                    Kind of a specific question but I'm hoping someone here will know. Guest ?

                    I monitored "Engine Fuel Flow" using ForScan Lite during my recent trip. The fuel rate was measured in "L/h". What does that mean? I'm guessing litres-per-hour (based on a list of acronyms and abbreviations from https://www.autoequipment.com.au/ima...0REFERENCE.pdf ) but I don't think that's right--doesn't make sense based on what I was seeing on the screen.

                    Example measurements (flat, straight road with no one around me and no significant wind from any direction):

                    45 mph: .24 L/h
                    55 mph: .32 L/h
                    65 mph: .48 L/h

                    No way the truck is only consuming .24 liters per hour (I wish).

                    What I want to do is convert these measurements into a MPG value.

                    A Ford Superduty forum is obviously a better place to ask this question...so thanks in advance for letting me ask here first.

                    Howard
                    In normal engineering terminology its liters per hour. Have you tried asking over at https://forscan.org ?

                    Keith
                    2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.

                    Comment

                    • #11
                      Yoda -- no, not yet. As I mentioned in the OP, looking to take a shortcut and ask the braintrust here. You never know...there's an incredibly diverse group that frequents this board.
                      Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.

                      Howard & Francine
                      2017 Ford F-350 DRW, '19 315RLTSPlus

                      Comment

                      • #12
                        howson Pulled out the old reliable HP48 and played with the numbers. That does not look right. However if I suspect the units are WRONG (partially) and that value is actually l/min I get about 8.54 mpg using 65 miles as the base mileage, 0.48l*60 = 28.8 liters = 7.61 gallons.

                        I have seen various scanners have units issues.
                        Joseph
                        Tow                         Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
                        Coach: 303RLS Delivered March 5, 2021
                        South of Houston Texas

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                        • #13
                          Originally posted by howson View Post
                          Yoda -- no, not yet. As I mentioned in the OP, looking to take a shortcut and ask the braintrust here. You never know...there's an incredibly diverse group that frequents this board.
                          They probably currently wont be much help - looks like they are based in Russia. See thier home page. I did not realize that so I probably wont be getting it if there is no support. I also don't see 2022 super duty compatibility. They have shut down most support. Not even sure if they are keeping thier forum up either. But I could be overreacting

                          I did do a search in thier Forum on the topic, but not much came up and what did it's over my head.

                          Trying to help

                          Keith
                          2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.

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                          • #14
                            Guess on my part, but some places in Europe state how many liters you get (use) per hundred kilometers. My relatives always ask me what my diesel truck uses per 100 k. I then have to get out my calculator, change gallons to liters, and miles to km’s.
                            Elke and Heinz
                            2018 Chevy 3500 SRW Duramax SB
                            2021 Reflection 337RLS

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                            • #15
                              Originally posted by Jlawles2 View Post
                              howson Pulled out the old reliable HP48 and played with the numbers. That does not look right. However if I suspect the units are WRONG (partially) and that value is actually l/min I get about 8.54 mpg using 65 miles as the base mileage, 0.48l*60 = 28.8 liters = 7.61 gallons.

                              I have seen various scanners have units issues.
                              HP48. I own one as well as an HP92. Wonderful machines. Could be a unit issue or may also be a fuel offset. For instance an adaptive or an offset for temperature etc. There are easily over a 100k calibrations for powertrains. We would break these up as calibratables and measurables.

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