HAS ANYONE ELSE HAD PROBLEMS WITH NOTICABLE KNOCK "ENGINE" WITH THEIR TRUCKS, I THOUGHT IT WAS MY HYPERTECH PROGRAMMER, BUT FOUND OUT A FEW WEEKS AGO WHEN I CHANGE GAS STATIONS THAT IT WAS DUE TO THE PREVIOUS STATION I WAS USING "MOBIL" I CHANGED TO BP CONNECT USING THEIR ULTIMATE FUEL AND THE PROBLEM WENT AWAY, I DID SOME RESEARCH ON BP WHICH USED TO BE AMOCO THAT THEY ARE THE ONLY COMPANY THAT HAS LOWERED THERE SULFUR IN THEIR FUEL BY 65% WHICH ALL COMPANIES WILL HAVE TO DO BY 2006 WHICH COULD POSSIBLE A FACTOR IN SOME OF THE DETONATION PROBLEM I WAS HAVING. JUST THOUGHT I WOULD LET EVERYONE KNOW IF THEY HAVE BP IN THEIR AREA....