For those of you with the Ultra-gauge. Do you have to reset the fuel each time you fill up or does yours read the fuel level sensor? I just got mine and when hooked up it didn't read the fuel level. I have an 02 Limited.
Yes, you need to go into the fuel menu and select "fuel fill up", or "partial fill up". For partial it will need to know how much fuel you put in, and for fill up it will simply reset it to full.
I have mine set at 17 gallons, that way by the the time it says I am about empty, I know I need to get more. Our tank is 18, but some of the last gallon can't be used, so better to be safe than sorry.
Change your max gallons back to 18.5 gallons. Fill up. Drive until close to empty doing your normal route city/highway.
Then fill up again and note how many gallons you used.
Now on the Ultra-Gauge, I believe it's under "vehicle setup>calibrate (or something like that)" you can calibrate how many gallons were actually used compared to the calculated. The UG creates a multiplier and adjusts everything to get a more accurate reading.
I originally set my UG to 17 gallons, but this is way better.
There's also a way to calibrate your rotational distance, but I haven't tried that one yet.
I have mine set at 17 gallons, that way by the the time it says I am about empty, I know I need to get more. Our tank is 18, but some of the last gallon can't be used, so better to be safe than sorry.