|
Mine is definitely not *dead-on-accurate* on my VW TDI... but it is close enough that I can get an idea if I'm doing good on a tank or not. And that translates pretty well to daily, trip, and instant readings also. It doesn't really matter to me that I'm actually getting 45mpg when the SG says 41mpg... but it does matter to me that the SG says I'm getting 36mpg when I know I can do 41mpg on the same section of the road (over a single tank, I'm pretty good at reproducing trip FE numbers with the SG; across tanks its not too hard either). So even if the SG is off a little, it helps me improve my FE overall.
I do have a fairly consistent driving type... mostly freeway, very little city which probably helps.
__________________
|