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.
See post 130 for background.
Second tank with 6 oz/20 gal.
336.4 miles on 20.2 gals.
16.6 mpg.
Disapointed!
slight increase over normal but not 18mpg like first tank.
Depending on how the third tank goes I'll try 7-8 oz per 20.