Hi Norm, it�s only $30 and it lasts me for about 2 years. At least then I can have confidence I won�t have any problems with the fuel I�m using. This is a good little read if you�re interested:
https://www.bp.com/content/[Censored]/bp-country/en_au/media/fuel-news/petrol-life-vehicle-tanks.pdf
I know it�s a BP document, so take it as you will
Also, I meant gumming up in my previous post, didn�t pick up the auto correct and can�t edit now
Cheers,
John