I have @ 2001 prius I changed plugs and sit filter and I am only getting 200 miles to a full tank any body know why that could be Posted via the PriusChat mobile app.
Welcome. Perhaps @bwilson4web has some ideas. I think most Gen 1 owners hang out in the Gen 1 & Gen 2 forums although there are many ex-Gen1 owners here. The Gen 1 forum is here. Generation 1 Prius Discussion | PriusChat
You're going to have to add more details. My first reply is 200 miles per tank on a Prius means you filled up 4.5 gallons of gas.