These numbers come from a web site that can compare the two cars. They have been cut 'n pasted.
I will not vouch for any of the performance specifications as I'm not sure which year they measured. Also, my Passat had a performance chip that changed things a bit.


PASSAT // SX4

Cylinders
L4 // L4
Displacement
1984 cm3 // 1586 cm3
Power
85(115)/5400 KW(hp)/RPM // 88(120)/6000 KW(hp)/RPM
Torque
126.9/3500 lb-ft/RPM // 115/4400 lb-ft/RPM

Fuel System
Multipoint Injection // Multipoint Injection
Fuel
Petrol // Petrol
CO2 Emissions
204 g/km // 149 g/km

performance
Top Speed
120.5 mph // 109 mph
Acceleration 0-62 Mph
11.5 s // 11.5 s

transmission
Drive Type
Front Wheel Drive // All Wheel Drive
Gearbox
Tiptronic Automatic // CVT

brakes
Front
Ventilated Discs // Ventilated Discs
Rear
Discs // Discs

tires
Size
195/65 VR15 // 205/60 R16

dimensions
Length
184.25 in // 161.4 in
Width
68.89 in // 68.1 in
Height
59.05 in // 61.6 in
Front/rear Track
59.84/59.84 in // 59/58.8 in
Wheelbase
106.29 in // 98.4 in
Ground Clearance
5.1 in // 7.5 in
Cargo Volume
17.5 cuFT // 9.5 cuFT

weight
Unladen Weight
2938.8 lbs // 2646 lbs
Gross Weight Limit
4188.7 lbs // 3715 lbs

fuel consumption
City
19.6 mpg // 29 mpg
Highway
35.6 mpg // 43 mpg
Combined
27.6 mpg // 36 mpg