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Message: <blockquote data-quote="sn95gtvert" data-source="post: 796072" data-attributes="member: 11975">my mpg has dropped dramatically over the last few months. the last mod i did to my engine was my 1.7 roller rockers. i remember getting a bit over 18 mpg's in town, and the last long trip i took i was getting between 24-26 mpg depending on if my top was down/wind/mountains ect...on my last tank of fuel i netted 11.6 mpg, a lot of my driving was hwy miles and back country roads. i did one run against my friends fox but it was a 1st-3rd rolling race that only lasted a few seconds. my car smells hella rich when sitting at idle.could this be caused by bad cats?I've checked my plugs they are light brown no white black or wetness found altho they still stink like fuel. my fuel filter is about 2 years old now so i could probably use a change there. i also checked my plug wires when i did the rocker swap, one came out with a 2 ohm difference reading more resistant (number 1 spark plug wire also the shortest) i have some spare Taylor wires but they don't have the angle tips so my headers will toast them.what do you guys think could be causing my sudden drop in mpg's???</blockquote>