What is the top speed you have attained driving your ZHP?

I know this sounds a little bit like Kindergarten-type question, but how fast will a non-modified ZHP go? I realize the wiki and FAQ pages say 155 mph, but has anyone really gone that fast on or off track?

I live in an area with a lot of hills and curves, so there are few places to really wind it up to top speed. Fastest so far for me was 127 mph.