Bump for next week after my first test run.
1996 GMC K1500 extended cab.
5.7 Liter
4 speed auto trans.
151,000 miles.
45 mile drive to work.
2 miles @ 50 mph.
12 miles @ 65-70.
4 miles @ 25-50.
20 miles @ 70.
7 miles @ 45-60.
Hot weather, heavy A/C on return trip.
Typical mileage 15-16 MPG.
First tank with 6 oz acetone/20 gal.
319 miles on 17.5 gal for 18.2 MPG.
Seems to have improved noticeably.
See what the next tank full does.
Not definitive but promising.