What year? The 2002 and later model years got a larger engine with more HP
and torque, and perform a little better.

A 2002 coupe with a tip goes 0-100 Km in 5.5 seconds per the owner's
manual - a C4 would be a .1 or .2 second slower.

Top speed is 280 Km/hr. for a 2002 tip coupe.

If your car is a '99 through 2001 model year you can add another .1 or .2
seconds to 100 Km, and drop about 5 Km/hr. on the top speed.

I have a 2002 coupe 6 speed and get 26 to 27 miles per gallon at steady
speeds of 70 - 80 mph. Mixed city and highway usually runs 22 to 23, and
strictly city is 18 to 20.

try

www.rennlist.com

they have forums devoted to specific Porsche models and also tech forums -
there's bound to be some C4 guys there who have all the figures.............