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    Gph / rpm

    I have tried "googling" this with no luck. Does anyone know the gallon per hour consumption for the 4.6 running through various RPM? I have seen these descriptions for various boat motors.

    #2
    It isn't linear, I can tell you that much. Engine load in a given gear would play the most important factor IMO. But then you can elaborate on that with the things that affect it, such as tire pressure, road grade, load, engine health ect ect.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

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      #3
      I want a rough range so i can calculate the GPH vs MPH and see if there is a big difference when cruising 55 or 65mph. I know with boat, i found a website that will show rough GPH at different RPMs. I use that value to decide what RPM to cruise at after I plane so im not dumping fuel in the bay

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        #4
        68-72 netted my best MPG with dual exhaust and 2.73 rear gears. The 4.6 does pretty good for economy when kept between 1500-1900 RPM.

        Of course load, terrain, gearing, and mechanical condition are major factors.


        My Cars:
        -1964 Comet 202 (116K Miles) - Long Term Project
        -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
        -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
        -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

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          #5
          I don't suppose your model has the instant fuel economy readout? Thats the easiest way to tell. Failing that if its new enough for obd2, even a cheap bluetooth scan tool and free software on your phone should be able to give instant fuel economy to see what the most fuel efficient cruise speed is.
          86 Lincoln Town Car (Galactica).
          5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

          91 Lincoln Mark VII LSC grandpa spec white and cranberry

          1984 Lincoln Continental TurboDiesel - rolls coal

          Originally posted by phayzer5
          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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            #6
            Found some info about it... https://stackoverflow.com/questions/...bd2-parameters
            As stated, if you have a 96+ model, you can use an OBD-II bluetooth adapter and Torque Lite, OBD Fusion, or similar FREE app to show instant fuel economy values reported by the PCM.

            Also, this is the cheapo OBD-II adapter I use and it works like a champ. https://www.amazon.com/gp/product/B00PJPHEBO/

            Only two things are infinite, the universe and human stupidity, and I'm not sure about the former. -- Albert Einstein
            rides: 93 Crown Vic LX (The Red Velvet Cake), 2000 Crown Vic base model (Sandy), 2003 Expedition (the vacation beast)
            Originally posted by gadget73
            ... and it should all work like magic and unicorns and stuff.
            Originally posted by dmccaig
            Overhead, some poor bastards are flying in airplanes.

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              #7
              My car does not have the read out. I also did not realize OBD2 bluetooth was so cheap. I will have to pick one up, thank you for the link

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                #8
                Originally posted by DonLawson84 View Post
                My car does not have the read out. I also did not realize OBD2 bluetooth was so cheap. I will have to pick one up, thank you for the link
                It's a generalization. It won't give you exact as the display on the tool doesn't match the car as far as fuel economy, if anything it's a little more towards the efficient side vs what the on board display on the dash says for fuel economy. But if you have nothing else to reference it's a good idea.

                Another idea is to utilize a vacuum gauge and monitor vacuum at different cruising speeds. Higher vacuum nets you better fuel economy. Also a standard tripminder from the 80s models will also wire up but not really any place to put it. Assuming the car in question is not a 98+ towncar and is pre 2006 vic/grand marquis.

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