The ET Genie kills everything consistently. I've been running cars since 2003 and have been 6.70-8.00s in the 1/8th depending on the car and combo. With using the ET Genie on my 6.70 car trying to run the 7.10 index my 60', 330, 1/8th mile and mph are pretty much consistent to what my increments were when my car ran 7.0-7.20s. It's nice to have more mph than your competitor as that may make them misjudge the finish line, but I'm not overly concerned with MPH as long as I can cut the light and run the index.