...Then I will fill up the tank for a full tank calibration...
I would suggest maybe doing a highway trial that can be completed in an hour or two and still be tenths or hundreds of a MPG accurate. Then you could have you gauge up and running (calibrated) a lot sooner. Top off, spend some time enjoying that sexy Del Sol of yours, top off again, and calculate. I've done a few tests this way and the results are surprisingly accurate. Accurate enough to measure the effects of a few degrees of ambient temperature difference in fuel economy.
Scouring the country for an excellent condition Civic VX
I found a convienient place to mount it. I didn't really need a case. you can't see it from the outside of the car because it is hidden by the safety and emmission stickers.
Another interesting point is the % time the engine is running and FE while the engine is running(shown as 76% and 19.46 km/l). During the 6 mile test run, the injectors were only active for 76% of the trip time, either because the engine was off completely or the injectors were cutoff during closed throttle engine braking. Whil the engine is running, my FE is shown as 19.46 km/L or 46 MPG. Now some of the off time was due to stopping at a convinience store for a few minutes to pick up some stuff. Also I had the supermid runnning for several minutes during installation so the 27 minute and 21km/h ave speed are not truly indicative of the trip.
I know that this is rather USA-centric of me, but it DOES display US miles and gallons, right?
Not with it's current programming. I thought that I would just adjust the fuel and distance parameters to force a MPG output but unfortunately there is not enough range in those numbers to do that. I am used to km/L from having it in my Prius. Just take the the km/L output and multiply by 2.35. My target is 22 km/L which is 51.7 MPG. If you just keep that target in mind, you at least know if you are above or below it.