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If your MPG dropped AFTER you had your rotors changed check to see if they were installed properly (a major red flag to this is wheels being hot to the touch after drives, poor coasting ability, and hearing metal rubbing against metal when driving slowly with the windows down). My Civic's MPG went down from high 30s (prior to modding) to around 30-31 due to the caliper dragging.
A couple other things could be:
- Bad tire alignment (requiring more effort on the part of the car to drive straight)
- Old fluids (transmission fluid, oil, brake fluid, etc).
A dragging emergency brake could also be a possible cause. So could short trips on a cold engine combined with high speeds and little coasting.
Are you monitoring fuel economy with a Scangauge? It could be miscalculated too, unless your low MPGs were from a tank refill direct calculation.
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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