one more thing, when you are making runs with the gtech make some runs in each direction over the same section of road, if your times are off by more than a couple of tenths then the road probably isn't flat.

 

Yep, I did that with these. I did a fourth but must have let off just before the 1/4 since it only logged the 1/8. Its a good flat road with no drivways and very low traffic. I am going to run the vette tomorrow