User blog comment:Brick425/The Impala SS/@comment-5111283-20160321011951/@comment-26944420-20160321225406

I Googled it and it said 18 MPG, which is probably pretty accurate. Not far from the modern Impala, which is around 20-22, but without the supercharger it'd be 20-22 also.

Better than the 2 you'd get from the 10L Mercs I was looking at before tho