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It can be..........and this is affected by a number of things. Ask when it was serviced last and if he (or she) has been using any fuel additives. Those would be two things that can affect this. I would not be that concerned about that, but it might not be a bad idea to have it checked out by a competent mechanic. Hope that helps here. Please get back to me if you need more on this.
Just checking back in to see if you were able to get this resolved or do you still need some additional input from me here?