Calibration:
So at first i didn't know where to start so I looked at the wiki
MPGuino - EcoModder
and used the civic vx ppm and milisec/gal figures of
1994 Honda Civic VX 49-state 1.5L lean burn 5 spd manual 8208 0279235000
I zeroed my odometer, hooked up my garmin nuvi 765t and zeroed that out too, and zeroed the tank and current figures on mpguino.
I drove about 2 miles and calculated that the mpguino was reading the mph too low, with a rough calculation it was reading 2-3 mph under what my gps said at 40mph so this was about 4.8% too high. So i reduced the ppm from 8208 to 7801.
I then drove to gander mountain and back which was 54 miles exactly according to the gps, and 54.12 miles according to mpguino. So I did another calculation in that at 54.12 miles with 7801 pulses/mile, it read 422190.12 pulses, dividing this by the actual miles by gps of 54, I found a new ppm of 7818.335.
I plan to use this new ppm for a full tank of gas and then recalibrate a final time to zero it in perfectly.
What i'm wondering is this, do taller tires throw the ppm off? I'm guessing it must, but this is a common misconception about changing tire size and if it will throw your odometer and speedometer off, and I can never remember which answer is right. Somebody help?