Liqui moli, kixx, zic, total to name few.
regarding tyres,185,195 will make car heavy and your economy will decrease.
I switched to 175 from 165 and my average dropped from 23 to 20km/l.
Go for the recommended wheel and tyre size, any addition to that will only effect average. Yes ground clearance can be increased by wider tyres or by increasing wheel size.
You can also achieve ground clearance by placing spacers, but then you car will become uncomfortable.
People have also suggested bigger springs.