On 07/20/2017 05:59 AM, Mad Roger wrote:
Here's a seemingly expensive "fuel economy meter" which shows the
complexity of calibration, heated probes, high-speed sampling, auto zero,
etc. whose specs show a "resolution" of "± 2% reading" and a "repatability"
of "±2 % of reading" with a "span drift" of "±2 % of reading"
http://mustangae.com/products-servic...+Economy+Meter
http://mustangdyne.com/mustangae/upd...09/MAE-FEM.pdf

OBCII. You are plugged into the car's computer system, air mass sensors,
injector timing, the whole works.