You are ignoring the very real possibility that there could be a negative result meaning the actual results could be (-31 to +31% increase in fuel economy and a -35 to + 35 hp increase....)amm888 said:it "as high as" 31% and "upto" 35 hp. so the 0% improvement and the 0 hp gain would fall right into the expected limits (0-31%, 0-35 hp).
i think i might just try one!
And before you installed them you saw what? 36MPG?khoerling said:I installed four of these in a row.
Four must be the magic number because I regularly see 30mpg!