Based on OLD experience when I lived 60 miles from my supply of BG44k, I used Techron with Chevron Premium with every other tankful to approximate the over all performance of BG44k. Tried to get by with this method for 3 years.
Easy to try, start with a clean engine BG44k before the oil change then use Techron for a month or two then BG44k to see if you can feel a difference.Modern high varnish fuels don't seem to require more than 1,500 miles of city driving to be noticeable.
http://www.chevron.com/product...shtml
Chevron Professional3-Step Fuel System Cleaner is recommended for a complete cleaning every 15,000 miles or annually. A copy of BG systemTECHRON® Concentrate is recommended for preventative maintenance every 3,000 miles or with each oil change.
http://www.chevron.com/product...shtmlh ... ct...shtml
This might scare you, a study on ethanolized fuels and deposits vs gasoline:
http://www.deh.gov.au/atmosphe....html