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Both reputable shops. Neither of them can think of any reasons off top of their head and said there's really not anything they can do. Rennsport in Sealy, TX and Swiss Garage in Houston. I don't have the experience to take stuff apart for diagnosis purposes and I am afraid I will do more harm than good. I can always buy the durametric software and get any readings off that..but not sure if it wiby SoundMaster - Main Forum
Went by the shop today..and they said if there's no CEL, there's not much they can do. The tech doesn't think the new plugs would cause a drastic change in mileage without causing an CEL. Bummer. Would anything show up in durametric without a CEL? Maybe I can buy one and scan it myself? I am tempted to take the MAF out and clean it..but I was hoping the shop would do it.by SoundMaster - Main Forum
Thanks again for the detailed reply. Are you saying the 999 170 130 90 ones are not right? It's also the same one listed in the parts catalog. I didn't pick it out..it's what's listed on my service paper. Can the indy shop verify if the O2 sensors are working properly?by SoundMaster - Main Forum
PDK. I am in Houston, TX. It definitely is a noticeable difference in mileage. I am guessing it's the new spark plugs that are causing the issue...considering it started after the dealer changed. What's funny is when I took it back there, I probably waited about 30 mins at the most..guy comes out and goes "nope everything looks good, spark plugs look fine..". Huh? You looked at the spark plugsby SoundMaster - Main Forum
Spark plugs are Bosch FGR5NQE04 (999 170 130 90) Air filter - 987 110 133 00 Tail pipe doesn't look any different. I agree the first instinct should be look at the auto shut off and gallons filled..but I am trying to see what else it could be. From the needle being at 4/4 to the needle coming down to 1/2...that's about 8 or so gallons. Currently I am at 110 miles on 1/2 tank... 110 miles / 8by SoundMaster - Main Forum
Nope. Have always done the highest grade at either Chevron or Exxon.by SoundMaster - Main Forum
That's correct. I have done 2 tanks so far but I noticed it right way since I keep a keen eye on the fuel gauge and miles driven. The OBC is showing 15mpg since the last fill up. It used to be in the 20s. The only thing I can think of is maybe the MAF sensor is dirty especially since it was not replaced after having a failed air/oil separator. Even when I had a failed AOS, i didn't get a CEL. Aby SoundMaster - Main Forum
Thank you for the reply. I realize the amount filled up can vary, so I go by gallons filled based on the fuel gauge level. If the light comes on, then assuming about 3 gallons left...I figure I should be filling up at least 13 gallons. I don't really go by the auto shut off since it turns off prematurely most of the time. If I fill up between 1/4 tank left and the before the light coming on, I dby SoundMaster - Main Forum
Hi.. I usually average about 220-240 miles on about 12-13 gallons of gas (18-19) which is kind of low to begin with. That's a mix of highway and city. Recently I had the dealer do an oil change, new spark plugs and an air filter. Since then I have noticed I am getting about 4-5 mpg less. I took it back to the dealer and they didn't find any fault codes. Even if I drove only city at 18mpg x 13 gaby SoundMaster - Main Forum