So in my quest to correct my mpg readings, and calculate the % difference in actual miles traveled to the trip miles, I realized I was plugging my insight wheels into the calculator as 13 inch rims and not 14 inch. Could anyone double check this for me? Using this calculator (pictured), I'm comparing the stock OEM size 165/70/13 combo with the current 165/65/14. Is the red circled number the right percentage I should be ADDING to the overall trip miles? It looks like the insight wheels and tires are just slightly larger than stock. I'm just a little confused as to why my speedo is reading off (it will say I'm going 60 when I'm actually going around 58). According to the calculator, it should be slightly the opposite.
I did replace my VSS with one of the cheap $9 ones from ebay because I was trying to fix my jumpy speedo problem. (It didn't fix it at all, actually made it worse). Could that maybe be the culprit?
