Tuning Chip going into the Hilux (2000 non-turbo)

Well the deal is this, we're going to go for a drive beforehand, then he's going to put it in, and then we are going to go for a drive afterward. If I like it I pay for it, if I don't I give him $85 installation and de-installation fee.

I negotiated this because he sell's Hiclones. I had one. I don't believe they work. The only reason I am continuing with him is because I know he doesn't make the tuning box so I don't care about what he claims.

So, if the increased power and torque exist other than in my mind i thought I would be seeing decreased RPM at set speeds as a measure of increase power and torque. Am I getting basic mechanical relationship between rpm and power and torque wrong here? Because I planned to take the rpm at set gears and speeds and then do a direct comparison on the day. I just didn't think I could get better economy by using the same rpm to get the same speeds.

I do know:

"HP is directly proportional to torque and RPM. "Directly proportional" means there may be a multiplyer involved, so let's find it using our example numbers, remembering that 1 revolution per second is 60 RPM:

torque * RPM * constant = hp

87.5 lbf-ft * 60 rev/min * X = 1 hp

X = 1 / (60 * 87.5) = 1/5250

torque * RPM * 1/5250 = hp

hp = (torque * RPM) / 5250 "

I know, this could be an embarrassing question but what the hell.