Dave

it all depends on how you drive it , what i find with mine if i stay at 3 k/3.5k rmp and below in 5th with the XO38 injectors i can get easy 300+mpg on a full tank....

when my engine was brand new dynoed 400+, i went to france and italy with the family as long as i stayed at about 3.2k rpm in 5th fuel consumpsion was very good ...i suppose it's how we drive them what discides the MPG

cheers marco