Quote:
Originally Posted by Night_Sailor
In the mean time I started using Opti-Lube XPD and saw an immediate jump in fuel economy to 17.75 mpg on mostly highway at 62-65 mph, with some city.
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Did you change anything else at (approximately) the same time ?
A 6-11 % improvement at the low MPGs that you're seeing, is a massive change in fuel consumption.