Mastana

Hey guys, i got a problem with my sc400. I have a 1998 Sc400 114k on the dash , it is giving me some issues. I'm getting 16 mpg and that's me driving calmly. I have a couple friends who are getting 18 mpg same year without an issue and they beat on their cars more than i do. I brought my car to 10 different mechanics and none of them had the answer to the problem. I change my air filter , fuel filter , spark plugs, and used techron this was all done about 5,000 miles ago. I do my oil changes every 3k miles Mobil 1 fully synthetic 5w-30 and i fill up my car with BP, Exxon, Hess and Sunoco gas super all the time. Its weird i cant get to the bottom of this and find out why. Any comments, ideas , or help would be greatly appreciated .
Thanks for reading

SC400slide

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