Is 55mph really more fuel efficient than 70, or is that just
propaganda? How much fuel will I save if I inflate my tires to 40psi,
where my Mazda6 gets a better ride, compared to the "recommended" 32psi
where it wallows like a sick pig? Do fuel additives effect the
mileage? And if so, which ones, and in what way?
How much of that does your "common sense and a light foot" provide an
And the instant MPG reading is only one of the many functions of the
thing. It also does:
Reads Trouble Codes
Reads conditions that set the Trouble Code
Clears Trouble Codes
Turns off "Check Engine" light
Make and store up to 10 rewritable special codes to send to the vehicle
Digital Gauges - Shows 4 gauges at a time from the possible following:
Fuel Economy (MPG - gasoline engines only)
Fuel Rate (GPH - gasoline engines only)
Intake Air Temperature
Engine Speed (RPM)
Vehicle speed (MPH)
Manifold Pressure (not available on some vehicles)
Maximum Coolant Temperature
Fuel Used (Gasoline engines only)
Trip Fuel Economy(Gasoline engines only)
Distance to Empty
Time to Empty
Fuel to Empty
It arrived today and I plugged it in. Couple of things... why does the
MPG gauge jump around so much? At one point, it claimed I was getting
130MPG, and another it claimed 99999MPG. Both of those, and similar,
were transitory, only lasting a couple of seconds. But still... there
is no way a Mazda/Ford 3 liter V6 with over 80K miles ('03 Mazda6s) can
+ever+ get 130MPG!
And, it's physically bigger than I expected. I'm having a hard time
finding a good spot to mount it. I don't want to put it on top of the
dash for a variety of reasons. I could put it to the left of the
instrument cluster hood, but then it blocks the side defroster vent.
Nowhere on the center console is good because it'd block a display or
control. On top of the ashtray cover would be good, but then I'd have
to take my eyes off the road too long to see it. I've currently (and
hopefully temporarily) velcroed it to the base of the instrument
cluster. I thought of getting the "BlendMount" (via Amazon, of course)
to mount it above the rearview mirror, but there isn't enough room
between the mirror and the light/cubby/moonroof switch panel in the
Hmm... maybe I can put that mount +under+ the mirror instead...
----- Original Message -----
From: "Jeffrey Kaplan"
Sent: Tuesday, November 25, 2008 4:35 PM
Subject: Re: ScanGauge II?
That MPG your looking at is the "instantaneous mpg". You need to look at
"Tank" + "Current" mpg
At any moment if your in neutral, or coasting clutch in, your mpg varies
widely, even between uphill + downhill... on the instantaneous MPG..
Ok, I finally RTFM. Apparently, an MPG reading of 9999 means that the
car had momentarily turned off the fuel injectors, and there is a
threshold setting I can set that should prevent that particular
reading, but it wasn't too clear about other effects.
Still trying to find a good place to mount it.