I change mine at each oil change and carry extra filters in case I get a bad batch of fuel out on the road. I've only had to replace filters "on the road" once in 35 years!! I try to fuel up at reputable stations and I use a high quality fuel conditioner.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!