There aren't any adjustments for the DIC. Your range is a calculation based on driving habits. If you want a more 'instantaneous' picture of your range based on your driving style at the moment, then hold the reset botton on the DIC while in Range mode until the display resets. From there your range will be recalculated and the number shown about 30 seconds thereafter is about as accurate as you're going to get.
People may also want to note the Reset in range mode when the DIC is only showing 'LOW' on the display. By using the reset the DIC will recalculate and display the expected range.
40th Anniversary Edition
13.074 @ 106.579
FWI | 4" Intake | LQ4 | N* TB | Custom TB Adaptor | Ported SC | 2.8" Pulley | Custom Intercooler | Ported LIM | Custom Ported Heads | 105# CC Springs | Modded Retainers | Oil Restricted Push Rods | CC OE-R Lifters | XP Hot Cam | TOG | HF Cat | 2800 ST | 3.29 Gears | DHP PowrTuner | LC-1 Wideband | Engine now retired |