When I got my license back in the early 2000s I got taught very economical driving, generally choosing gears to keep rpm low, use the motor brake to decelerate before traffic lights, such stuff. Then it was time to get on the Autobahn, and the instructor just said "Forget everything I taught you, now it's safety first: Floor it in 3rd gear, merge in third gear, once you've found your position switch directly to 5th you'll be fast enough."

If I'm not mistaken that was an Audi A4 TDI so... 15 seconds 0 to 100? Maybe about 10, don't remember the displacement. Of course, merging is more like 30 to 120, directly onto the second lane. With a Punto you're kinda lucky if you get to 80 by the time the on-ramp ends and barely get into the right-most lane (where you're probably staying).