Yeah good idea for gas.
You can also add a little direct to the petrol tank next time you fill up.
Morreys have cleaner product built in as well as lube qualities.
Problems accure with leaving fuel in injectors for extended periods.
Gumming up and deposits sticking etc.
The princable idea, Morreys should help minimise this trouble.
Penrite is a good lube but does not have cleaner built in, had no engine trouble with this, but returned to Morreys for cleaner additive.
Only used Penrite for a short period, can't really say 1 way or the other for sure.
I spoke with Penrite tech man, he gave me that information for no cleaning additives in their product.
Hate flaslube caused bad ping in a sound engine.
Fuel doctor returned worse fuel ecc, 3lt worse per 100k.
Cheers