Android FusedLocationProviderClient : slightly off position

Question

We are using FusedLocationProviderClient to fetch GPS location continuously in our app. We find that the location provided is slightly off (about 200mtrs) and delayed by about 15-20secs. This causes problems while driving.

The code snippet is below. Please let me know what we might be doing wrong, appreciate your help to fix this. If there is a better method to fetch location continuously, please suggest that as well.

mFusedLocationClient = LocationServices.getFusedLocationProviderClient(context);
locationRequest = LocationRequest.create();
locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
locationRequest.setInterval(500);
locationCallback = new LocationCallback() {
@Override
public void onLocationResult(LocationResult locationResult) {

    if (locationResult == null) {
    return;
    }
    Location location = locationResult.getLocations().get(locationResult.getLocations().size() - 1);
    if (location != null) {
    currLatFusedLoc = location.getLatitude();
    currLngFusedLoc = location.getLongitude();
    }
};
};

mFusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, Looper.myLooper());