According to that test, a 1994 Villager gets 31 MPG at 25 MPH. M_a_t_t's vehicle page for his 1995 Tracer says that it is rated 31 MPG highway. 55 MPH? 65 MPH?
That chart says the Villager got 32 MPG at 55 MPH, so I would argue that is the target speed. That particular Mercury got 25 MPG at 65 MPH. Does that relate to M_a_t_t's Tracer?
After the calibration and being at operating temp I was maintaining @35 mph and instant readout was 50 mpg! that made me feel warm inside 
It is a start.
It turns out the Villager is a minivan rated 17/23. If the Tracer is rated 31 at approximately 65 MPH, maybe it will get 39.68 at 55 MPH, and worse at 45 MPH.
This is actually very close to what I saw (before calibration) on my commute to work. (~40 mpg @ 50-51 mph) I think my peak is below 55 probably about 40-45.
We have had different discussions about accelerating. Some say that it is vital and some say that it makes zero difference. This is easy enough to test, and it might make a necessary difference.
How far can you coast from 65 MPH? I cannot find anything on-line.
I am trying to think of a good test track, but have nothing yet though I would be interested in finding out.
Gasoline Fumes talked about airing up your tires. Metro tested coasting distance at different pressures, but I would recommend you tested out your particular car, area, and tires:
https://ecomodder.com/forum/showthre...tire-2721.html
He went another 13% going from 30 - 35 PSI to 50. I do not know how that relates to fuel economy improvements, but if you drove forty miles on one gallon and then coasted one mile at 30 - 35 PSI, that might get you another 700 feet, a total improvement of 0.3%, but if you make enough small improvements, you may meet your goal.
I currently have them set between 45 and 50 psi
I asked about MMO
here. In another thread [that I cannot find] someone told me "I would just leave it on the shelf." However, you could absolutely buy a jug, add it every other tank, and see if you notice a difference.
I haven't heard of using it this way. Is it supposed to improve mileage or clean your system?
I just reread the thread, forgetting that you removed the seats. If you dropped from 2,404 pounds to 2,304, you decreased 4.3%, and Aerohead says you should see a 2.1% improvement.
I did not realize the scale needed to be on a hard floor (vs carpet) so the number I posted is off. I did however remove the taillights and trunk in addition to the interior stuff I posted. However, I added a 60 lb deep cycle battery. I want to stop by the scrap yard and have the car weighed just to get an actual number. I am ~130 lbs so I think the overall weight with me in the car is probably still around 2400 lbs
Okay, 2000mc linked his Saturn chart, 37.1 MPG at 65 MPH, and 42.8 at 55. That is 15% better fuel economy, but 115% of 31 MPG is 35.65.
I do not know if we can find enough small improvements to increase your highway fuel economy by 93.5%, but we will keep trying to come up with ideas.
How is the boat tail coming? Have you done a grill block and air dam? That should get you a couple percent, usually most of the benefit of a belly pan, for a fraction of the effort.
I finished the tail, though I still need to put some more lights in. I put an upper grille block on and air dam, but ended up taking the air dam off. Now that I have the mpguino I might do some testing with the airdam on vs. off. I want to do a belly pan, but spending the time and the fact that nothing sticks below the bumper cover anyway doesn't motivate me enough. I also bought some mirrors so I can delete the side view mirrors. Wheel skirts are high on my list as well.
You might as well tape the seams, but do not expect much more than even weirder looks:
https://ecomodder.com/forum/showthre...tml#post465763
I think I will do some of the hairsplitting things like tape seams and remove wipers kind of stuff the day of the test.