QFile file("config");
    if (file.open(QIODevice::ReadOnly)) {
        foreach (QString line, file.readAll().split('\n')) {
            qDebug() << line.trimmed();
        }
    }

Консоль:
"6.30"
"0.92"
"1111"
"1"
"11.80"
"2222"
"2"
"11.80"
"58.00"
"50.8"


Или:
QStringList lines = file.readAll().split('\n');