16 MPG? Suggestions?

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  • Quinthirty
    Grease Monkey
    • Mar 2012
    • 318

    #31
    This is my average after all the improvements. But the traffic conditions I travel on are very hot, 70-80% traffic, 20% highway (short runs) only. Makes me envy you guys who average 22. Saw Bernzpeed's 29mpg which I think is unattainable for an M20B25 in our conditions. Running an A/T with 4.1 too.

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    • dnguyen1963
      R3VLimited
      • Nov 2011
      • 2648

      #32
      Originally posted by Quinthirty
      This is my average after all the improvements. But the traffic conditions I travel on are very hot, 70-80% traffic, 20% highway (short runs) only. Makes me envy you guys who average 22. Saw Bernzpeed's 29mpg which I think is unattainable for an M20B25 in our conditions. Running an A/T with 4.1 too.
      Why would it be unattainable? I routinely get 30 mpg on the hwy.

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      • BROKINBIMMER
        Advanced Member
        • Nov 2012
        • 195

        #33
        Ok, I have the thermostat and housing removed. Here's the problem, the new thermostat has no arrow....HELP!

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        • jlevie
          R3V OG
          • Nov 2006
          • 13530

          #34
          The thermostat goes in with the pyramid shaped end out. If there isn't a hole in the thermostat plate there won't be an arrow to indicate which way is up. Drilling 1/8" hole in the plate and positioning it up will make bleeding a bit easier, but isn't necessary.
          The car makes it possible, but the driver makes it happen.
          Jim Levie, Huntsville, AL

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          • Regnar75
            E30 Addict
            • Sep 2011
            • 483

            #35
            so just wondering but is your MPG's what your computer is saying or what you calculated? because i went on a 145mile roadtrip in my 86 ES with CAI and Mark D chip, and i got 39MPG (based on gas used from fill up to fill up) at 80mph. all the while my computer was telling me i was getting 27MPG.

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            • BROKINBIMMER
              Advanced Member
              • Nov 2012
              • 195

              #36
              Thermostat is in, TBD if its in correctly.


              And yes, I always calculate mileage by distance traveled rather than using the computer.

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              • BROKINBIMMER
                Advanced Member
                • Nov 2012
                • 195

                #37
                And just a small update, the car definitely runs a bit hotter with the new thermostat.

                Comment

                • digger
                  R3V Elite
                  • Nov 2005
                  • 5909

                  #38
                  mods delete this wrong spot
                  89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...

                  new build thread http://www.r3vlimited.com/board/showthread.php?t=317505

                  Comment

                  • Quinthirty
                    Grease Monkey
                    • Mar 2012
                    • 318

                    #39
                    Originally posted by dnguyen1963
                    Why would it be unattainable? I routinely get 30 mpg on the hwy.
                    This is why I specifically mentioned "in our conditions" because I live in the city and don't have a lot of highway runs. I'll probably achieve that only if I do out-of-town trips and close to pure highway runs, but still doubt it. I haven't even factored warmer average temperatures which affect mpg performance too. SF weather averages in the 50s-60s vs. our high 80s-90s year round.

                    Imagine this: The average speed that I get on a full tank of gas is roughly 10mph. It can probably go up to 14mph if traffic is "better." That means a lot of low gear runs.

                    Comment

                    • ELVA164
                      R3V Elite
                      • Dec 2011
                      • 4861

                      #40
                      Not for anything, but the low speed by itself is going to destroy your mileage. Right now, with temperatures in the 40-60deg F range, I'm averaging 28-30mpg in mixed conditions. You unfortunately have a lot less control over mileage with an automatic transmission, but at 10mph things won't be getting much better no matter what. As a side note, my OBC was almost spot-on the last three tanks I've checked using distance/volume consumed.
                      Interested in vintage cars? Ever thought about racing one? Info, photos, videos, and more can be found at www.michaelsvintageracing.com!

                      Elva Courier build thread here!

                      Comment

                      • ELVA164
                        R3V Elite
                        • Dec 2011
                        • 4861

                        #41
                        Just realized the post above me isn't from OP, but it's still true. OP, when you say it runs "a bit hotter," are you just using the gauge to determine that? Like Jim said, you should check the temperature of the head with an infrared/contact thermometer and make sure it matches your thermostat.
                        Interested in vintage cars? Ever thought about racing one? Info, photos, videos, and more can be found at www.michaelsvintageracing.com!

                        Elva Courier build thread here!

                        Comment

                        • dnguyen1963
                          R3VLimited
                          • Nov 2011
                          • 2648

                          #42
                          Even in city, I average 24 mpg through out the year. Hot summer does not affect mpg much at all. Something is wrong with your car if 14 mpg is the best you can get.

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                          • dnguyen1963
                            R3VLimited
                            • Nov 2011
                            • 2648

                            #43
                            Sorry, mis-read your post. You did say 14 mph.

                            Comment

                            • BROKINBIMMER
                              Advanced Member
                              • Nov 2012
                              • 195

                              #44
                              Originally posted by dnguyen1963
                              Even in city, I average 24 mpg through out the year. Hot summer does not affect mpg much at all. Something is wrong with your car if 14 mpg is the best you can get.
                              Do you have an auto trans with a 4.10 rear?

                              Comment

                              • dnguyen1963
                                R3VLimited
                                • Nov 2011
                                • 2648

                                #45
                                No autotragic...5 speed. I have read that with an auto trans one should still get @ 22 mpg in the city.

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