Here are some corrections of your assumptions about Prius.
The engine is 2ZR-FXE and here are the specs, source WikiPedia:
The Toyota 2ZR-FXE is a 1.8 L (1798 cc) Atkinson cycle variant of the 2ZR-FE. It has the same bore and stroke, but the compression ratio is increased to 13.0:1, and the inlet valve closing is retarded. The net result is that the engine has a greater effective expansion than compression. Output is producing 73 kW (98 hp) and 142 Nm (105 lbf ft) of torque, paired with electric motor/generators in the hybrid drive system; together the engine and electric motors produce up to 100 kW (134 hp) and 207 Nm (153 lbf ft)pm.
And curb weight is:
1,379 kg (3,040 lb)