Lasted edited by Andrew Munsey, updated on June 15, 2016 at 1:17 am.
'2004 Toyota Avalon' - Monitored engine for first 2 weeks of May, 2008. I have a 50 mile commute to work each day and I averaged 26 mpg driving at 60mph. On May 15, 2008 I added 3oz pure acetone to a full tank of gas and drove home from work and averaged 32.5 mpg driving at 60mph. An immediate 25% increase. Will run with acetone added through the end of the month and report average again.