my two cents:: '06 with original ECU after Barb jumper were 5, 18, 18, 21 --- avg mpg was 45+- 3 for the first 4K miles
orig ECU + 7 points= less low rpm stumble --- avg mpg was 43 +-3 for next 5k miles
updated ECU with barb jumper were 5, 18, 18 21 --- avg mpg was 44 for first tank...