The C172 takeoff performance charts for MTOW specify lift off at 51 KIAS and initial climb at 56 KIAS.
Most people would use the Normal Takeoff procedure, which is raise the nosewheel about 55 KIAS and climb at 70-80 KIAS.
Will this use more runway? Definitely.
How much more? A lot more.
Exactly how much more? No idea - there are no performance charts covering a Normal Takeoff.
If you the chart doesn't apply to your takeoff (using the manufacturer specified procedures), what is the point of grounding the aircraft when you are outside the temperature bounds of the chart?
The distances in the performance chart are very short.*
The reason we don't have PA28, C172 etc. running off the runway is not because people religiously use performance charts - it is because we use long runways and most people are not comfortable with less than 2-3 times what the performance chart specifies.
*Examples from the C172 chart:
Mildura, 40C, MTOW: ground roll 385m, 50 ft 600m. Add your Australian 15% gives you 700m to 50 feet.
Mt Hotham, 30C, MTOW:
520m ground roll, 910m to 50 feet. (+15% = 1050m to 50 ft)