So I like to watch my MPG and avg. mpg on my scangauge along with the coolant temp. These all display real time and work great, I just wish the avg mpg was re-setable and stayed cumulative not just since you last started the vehicle. The issue comes into play with 05-08 Xterras, if you want to display the trans 1 and/or 2 temps it delays all the displays/gauges so the mpg or avg mpg are no longer real time and you see a snapshot of them every few seconds up to a minute so these are no longer helpful numbers. I tend to setup my gauges without trans temps until I am in a situation where I really need to know it, like while off roading or towing or major hill climbs, and then avg mpg items don't help much as its horrible anyway.