I changed my car to synthetic and only noticed a marginal difference. it does help starting in the cold up north winters.
Get a scan gauge or equivalent, I went from 32 MPG to 40.2 MPG just by using the SG to change my driving habits. the SG saved me $276 in the first year. For you the same MPG jump would be about double the savings because of your lower MPG starting point.
Keep up the good work!
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