private void RecalculatePwRatio() {
double power, weight;
if (!FlexibleParser.TryParseDouble(PowerInput.Text, out power) ||
!FlexibleParser.TryParseDouble(WeightInput.Text, out weight)) return;
var ratio = weight / power;
PwRatioInput.Text = Format(AppStrings.CarSpecs_PwRatio_FormatTooltip, ratio.Round(0.01));
}