Road Rolling Resistance Assist Screen Has 15 Road Surface Choices 

RRR - ROAD ROLLING RESISTANCE

Road Rolling Resistance is a concept that is not very difficult to understand. The number that should be entered is a bit esoteric but, choosing one of these 15 different road surface buttons will allow you to get into the proper range of values you are wanting to simulate for.

CHANGING THE VALUE

Lets say you have chosen the button titled 'Heavy Rain' but, the highway you are travelling along has a lot of water filled pot holes or deep traffic ruts in lanes that have up 2 or 3 inches of standing water in them that your vehicle is having to plow through. Simply increase the RRR value a few points while watching the MPG to compensate for these extra kinds of rolling resistances that are in addition to the 'Heavy Rain' value you have chosen.