Maybe my first 0-60 run was a fluke but I ran a 3.91. Later in the day my thermometer said 99-100 degrees and my best 0-60 was 4.21. 1/4 mile at that temp was 12.60 at 115mph. I'll take 4.20's and 12.60's on a 100 degree day! Not to mention the humidity was high also. This is a great toy. I'm going to take it on a roller coaster or two since it is wireless.