You need to hit the Nitro
while driving exactly 88 mph. Find a straight road, be gentle with your
and wait for it. When you see 88 on the speedometre hit
and burn the nitro to the end. It does not matter if you throttle or not while holding Nitro. You may not get the cheevo at your first try but eventually you will get it. Give it a couple of tries. That's it!