I have 1995 Lexus SC 400 and Lexus SC 430, both were doing 18 mpg, suddenly both dropped mpg sc 400 is 1995, 10 mpg and the other to 15 mpg. It is 2003. No spark plugs have been changed but the drop

Asked by Nov 10, 2015 at 09:30 PM about the 1995 Lexus SC 400

Question type: Maintenance & Repair

I have 1995 SC400 and  2003 SC430 both were doing approximately 18 mpg.
Suddenly both dropped to 10 mpg and 14 mpg.  Dealer cannot figure out.
HELP,

1 Answer

40,445

Gas formulations are changed from "summer" to winter formulations around this time of year. You may be a victim of government meddling with gasoline formulations. Ask your gas station if they recently switched gas types.

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