at the risk of nit-picking:
32 litres to 30 litres/hr is rounding down, not rounding up - something not advisable for a fuel burn and likely to become a talking point with an examiner!
is the 182 litres all usable fuel?
You should expect to do the fuel calculation as part of the planning, and you should know about and be ready to use, the 'time and fuel to climb' chart in the POH, and a taxi allowance. Once in the air, consumption is going to be an estimate as you go, and of course subject to using correct leaning technique. For the FREDA check, making sure you are on the correct tank, the fuel pump is on or off as required, and there is sufficient fuel to get to your intended destination plus 30 minutes (by day VFR ) is the check.