Hi Iboomalot:

___I use topped off tanks to topped off tanks via the legal cal’ed pump and miles traveled per the legal odometer. There is no better solution for consistency although you can argue accuracy until the cows come home due to the OEM’s non-exact odometer’s and tire wear. NAV units boot up way to slowly to take into account any movement before at least 3 birds are locked up and a continual distance track can be measured. I am not even considering when they lose lock and show you ½ or more miles away before they get educated and jump back on course Heaven forbid when they tell you to take one route with their “Locked to Route” feature enabled (most OEM NAVI solutions do not allow you to change this ) and you take the alternate. That jump is always worth a tenth or two and I see it every day at the I-355 and I-55 junction just north of Joliet, Illinois. Another … I should upload a screenshot of the bread crumbs when I take a non-digitized road into my work location. You would think a drunk was driving though a 20 acre field instead of a single dual lane road into the exact parking lot and many times the exact parking spot each and every day.

___Jason, they should be more accurate but they are not in many instances unfortunately Another aspect that will never be accounted for by an OEM or non-OEM NAVI solution: The change in distance between the far right and far left lanes of an interstate through a turn. I have measured this more then once while on night shifts in the Corolla. Moving from lane to lane to cut off the corners (Inside lane at all times) shows a .5 - .6 mile difference over 93 miles then just taking the right lane all the way home. NAVI’s haven’t a clue what to do with that difference?

___Good Luck

___Wayne R. Gerdes
___Waynegerdes@earthlink.net