I'm not sure that's right. I downloaded the 2 stock tunes I could find for flex fuel trucks. The 04 had 33 lbs in the injector flow rates strait across the board and the 05 ramped from 35.5 lbs to 38.5 lbs depending on vacuum.

 

my '05 av had 38's in it and the radix injectors are 60's for the flexfuel

 

02 Flex Fuel Tahoe 38# injectors if I remember right. Didn't upgrade for the Radix, wasn't required. The wiring harness is different, the injector clips are different because the injectors are different. I have never seen a place that sells methanol. Has anybody? Anyway, Chevy gets a break on pollution laws by building these type trucks to counteract the gas guzzling Suburbans and 2500HD type trucks. It's all political. So many flex fuels allows them to build so many gas guzzlers....blah blah blah