Quote:
Originally Posted by Joe1234
I noticed you mentioned the vacuum gauge on another thread. Looks like the best option so far.
I'm skeptical of the MPGuino's accuracy. How can you be sure that it is accurate?
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I would definitely recommend the vac gauge, great learning tool, and as your foot gets better fine control it really helps dial in the mpg sweet spot.
The MPGuino just gets a pulse signal from your vehicle speed sensor (on the transmission) and a 2nd signal from one of the fuel injector leads. It's just counting injector pulses (and duration of each pulse) vs. the speed sensor pulses (miles/gallon). You take a long trip and compare starting and ending highway mile markers and compare to MPGuino's calculated distance by counting pulses. MPGuino has factors that it applies (x pulses/mile and x microseconds/gallon). If MPGuino's distance doesnt match the hwy markers, adjust the factor by the percent error. Same for MPGuino gallons used (once you fill up tank you'll know exactly how much you really used). Brilliantly simple technology that can be adjusted to match any car with any tires/transmission/engine combo. After averaging a few tanks (different gas pumps stop at different points, etc), the MPGuino will be pretty much dead-on. I was filling up at a particular pump at the same station every week for months - MPGuino was never more than like 1mpg off.