Quote:
Originally Posted by Gealii
As new as your car is it would be worth looking to see if you have dfco ( deceleration fuel cut off) which is basically an engine kill switch without turning everything off as long as you remain in gear. It cuts the fuel injectors while in gear. the reason it is showing 99.9 is because there is a limit to some gauges. the Ultragauge goes to 999.9 when coasting with engine off car on while I've heard the scangauge goes to 0
Also scangauge and ultragauge are fuel economy monitoring devices. they have the ability to show instant mpg, average mpg, engine load, intake temp, and many others by use of plugging into the obd2 port
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Scanguage ii goes to 9999.9, I believe. I think the highest I have seen under 9999 is 214 ish. Coasting, that is.
I have mine with red backlighting, in the format
MPH RPMS
MPG INSTANT AVG MPG
The Mustang speedos suck. It'sractically impossible to see the exact speed. I think so rim swapping won't show a difference, since Ford uses 17-20s, maybe higher.