I guess I should have been clearer I have only 2 1/2 gallons on my buggy and so far same plugs I have about a gallon each 1 1/4 really a little more on my OS RG with OS plugs and my STS D21B with a RB plug. On my Savage I run HPI plugs and get between 2 to 3 gallons. On he Savage I have WELL Over 7 plus gallons and only used 2 or 3 plugs if that. Then on my HPI MT I run either an OS 15 CV-RX that I have at least 8 gallons on it with OS plugs get 2 to 3 gallons on them. On my OS 18 TZ but only have about a gallon on it but original OS plug. I have others but get about the same on them as well but these are my primary 3. Most of the times I end up replacing them out of guilt more so then them going bad. People at our track that just closed say then have never seen me change a plug in any of them.