Tried 5w-20 no fuel improvements

Messages
429
Location
US
I switched from 5w20 for 4500 miles with gains i could see in fuel economy. 28 mpg average So i went to mobil 1 and now i am getting 2 mpg better. with M1 i am getting 30-31 mpg..
 
Messages
11,477
Location
Florida, Cape Coral
Useless statement without more information like from what oil to what oil (type and viscosity). Back to back runs? How many miles of each for comarison. Highway or city or both. etc etc. Give us more data.
 
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