weephee Posted July 8, 2005 Report Share Posted July 8, 2005 Hi Guys. I own a 99 and 2000 Seville STS. Both cars have had new fuel filters, spark plugs and the 99 has new spark plug wires. I burn high octane in both. The concern I have is the gas mileage. Both cars under ideal conditions ie. no AC on, 32 pounds pressure in the tires, driving at 65 mph get approx 22 to 23 mpg. When new they were advertised as getting 35 mpg on the highway. I have tried to find some info in these archives but haven't seen anything. I thought I had seen a poll some time ago about the mileage various members get but I can't find it. Anyway any comments or suggestions are appreciated. Thanks Link to comment Share on other sites More sharing options...
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