Like Parish has said before the road can make a big difference in times. If you don't know whether the road is level or not, make a pass going each way and average. I run mine on the same peice of road everytime I do a pass and my times are usually within .05 of a second, that is if I drive it the same way everytime.

 

Luckily where I test, it's a business area so I don't have to worry about residents. I'm use to driving my truck with the cut out open, in fact I have it open pretty much all the time haha. I like the raw sound I guess, just too bad it doesn't go anywhere though lmao. Oh well, at least I can scare the ricers into thinkin' I have about 600hp and will tear them a new a hole lol.