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Heat causing MPG's to dive?

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  • Heat causing MPG's to dive?

    So its been really hot around here lately. When running the A/C it of course drops a little bit but the last tank it really dropped I did fill it up fuller than usual. Is this heat making it drop? I have noticed a rough idle when I first start it until it warms up just trying to figure out if I have something else going on.
    1993 Festiva GL The Besty Festy

  • #2
    High temps give better mpg.
    youtube.com/neanderpaul 88 festiva LX w/BP G25 MR 5 speed waiting for wiring- 93 Festiva GL auto w/ air, waiting for B6t/G4A-HL - 98 Nissan Quest - 02 Mazda protege 5 wife's DD

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    • #3
      See thats what happened when it warmed up from being so cold but it seems like since its gotten really hot they have dropped.
      1993 Festiva GL The Besty Festy

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      • #4
        AC really drags the small engines down.
        91GL BP/F3A with boost
        13.79 @ 100, 2.2 60' on 8 psi and 155R12's

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        • #5
          I would avoid running any fuel with E10 when it gets this hot out. Otherwise, when the temp goes up the air density goes down and less fuel is required. Usually the MPG on an EFI vehicle will increase as a result.
          Brian

          93L - 5SP, FMS springs, 323 alloys, 1st gen B6, ported head & intake, FMS cam, ported exhaust manifold w/2-1/4" head pipe.
          04 Mustang GT, 5SP, CAI, TFS plenum, 70mm TB, catted X, Pypes 304SS cat-back, Hurst Billet+ shifter, SCT/Bama tuned....4.10's & cams coming soon
          62 Galaxie 2D sedan project- 428, 3x2V, 4SP, 3.89TLOC

          1 wife, 2 kids, 9 dogs, 4 cats......
          Not enough time or money for any of them

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          • #6
            That and of course, quicker warmups....
            91GL BP/F3A with boost
            13.79 @ 100, 2.2 60' on 8 psi and 155R12's

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            • #7
              yah I've noticed easily 3-5 mpg more out of each tank of gas the last month since its been hitting 95++F.. I got my best tank yet at 328 mi (I don't normally drop below 1/4 tank but I was low on dough that week) I don't run a/c unless my kids are in the car(no need for them to suffer) it robs way too much power from my poor lil 60 horse engine

              Ofc with my job I'm used to being exposed to all the elements and being rode hard and put away wet on too many occasions.
              2008 Kia Rio- new beater
              1987 F-150- revived and CLEAN!!!
              1987 Suzuki Dual Sport- fun beater bike
              1993 Festiva- Fiona, DD
              1997 Aspire- Peaspire, Refurb'd, sold
              1997 Aspire- Babyspire, DD
              1994 Aspire - Project Kiazord
              1994 Aspire- Crustyspire, RIP



              "If it moves, grease it, if it don't, paint it, and if it ain't broke don't fix it!"

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              • #8
                Originally posted by bhazard View Post
                That and of course, quicker warmups....
                Good point. Nothing kills MPG like a 15 minute warm-up twice a day!
                Brian

                93L - 5SP, FMS springs, 323 alloys, 1st gen B6, ported head & intake, FMS cam, ported exhaust manifold w/2-1/4" head pipe.
                04 Mustang GT, 5SP, CAI, TFS plenum, 70mm TB, catted X, Pypes 304SS cat-back, Hurst Billet+ shifter, SCT/Bama tuned....4.10's & cams coming soon
                62 Galaxie 2D sedan project- 428, 3x2V, 4SP, 3.89TLOC

                1 wife, 2 kids, 9 dogs, 4 cats......
                Not enough time or money for any of them

                Comment


                • #9
                  warm air will increase mpg to a point. Then the density drops so much that power output is so low that maintaining speed requires much greater throttle angle, which equalls greater engine load, which LOWERS fuel econmy.
                  Jim DeAngelis

                  kittens give Morbo gas!!



                  Bright Blue 93 GL (1.6 8v, 5spd) (Hula-Baloo)
                  Performance Red 94 Aspire SE (Stimpson)

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