The numbers I quoted were post-diesel increase. But it's possible that the numbers are wrong or used a different diesel cost at the height of the spike or were using a diesel price from a really high-tax state or were using a really inefficient truck. The numbers I used would have seen diesel be about twice what you're spending, which is an insanely high multiple. I have no reason to think I'm righter than you, I'm just trying to troubleshoot the reason I was off.

The labor to maintenance/insurance/etc. ratio seems to track pretty accurately. So maybe I should have said 3/6, 2/6 and 1/6 respectively (since the other responder wanted the same denominator).

I honestly didn't even notice the denominators were different. All of the fractions were in simplest terms, which is (imo) preferable to using a common denominator.

The other responder pointed out I was using the simplest terms, which frankly looks right to me. But the answer is more pedestrian. I read the information phrased it as 2/3 was diesel and 2/3 of the remaining amount was labor. So I eliminated the chain and simplified it to 2/3 and (1/3*2/3) 2/9.