[MetroMPG]

Just to be clear, I wasn't questioning the collective benefit of the mods.

Just saying that assigning an MPG value to smaller individual ones is tricky. But some people have a huge amount of carefully collected trip/commute data and can tease out small signals in the normal amount of noise.

On the other hand, I've seen people abandon (reverse) small mods because they were convinced they did nothing, when it's more likely any real effect was just too small to be seen above normal variation or even if tested (A-B-A).

I think it's great what you're doing with the C-Max.