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new engine might already be experiencing "blow-by". search for a manual and check compression values. then have a mechanic perform a compression test on your engine. if result is much lower than expected, then try replacing piston rings, valve guides, and valve seals
Cars are just like airplanes. Weight will always have an effect on fuel milage. Check your tire inflation. We find, in our shop , that low tire inflation in the biggest cause of poor milage. (beside a lead foot like mine)
The ck engine light is telling you to have it scanned and it will have a trouble code to indicate where to look for the problem. You may have a Vent valve or purge valve problem, it may just be a coincidence that it happened after filling up.
Air is colder or more dense needs more fuel to make mixture correct. Is the exhaust tight. I know v6 had donut seal problems. would **** air in and 3rd o2 sensor would read lean and ecm adds more fuel. Just a thought
You should get the problem code ran at a shop or auto parts store. My moms 2003 Toyota Echo check engine light came on and it had a slight misfire, I replaced all the sparkplugs about $20 and no check light.