Yaris using too much gas lately

[Salm0nLvr]

I'm not sure why my yaris has been using too much gas given that I haven't changed my daily commute, and temperatures been getting warmer. This has been a problem since I got into a minor accident two months ago (cosmetic damage to the front only), and after my car's mpg got lower.

For the time I was still driving it before the mechanic, using fuel injector cleaner slowly brought its mpg back up, but after getting it back from the mechanic, its like I'm back to square one! its using 6.8 gallons for 183 miles, when before I could have used 5.5 or less

Any recs for how to fix this issue would be nice in the meantime <.< I guess I'm back to feeding her more iso heet