Englishhal....2 big blokes and 2 girls in a new 172R?
Unless the're kids under 5 this will put you over weight.
Usefull load for a 172R is app 770lbs.
2 blokes 350lbs
fuel 318lbs
leaves 102 lbs for luggage or 3rd pax.
An anorexic might do...
The fact that Mr Cessna put a georgeous high lift wing on it don't mean you gotta do it right?