[gone-ot]

The "hidden agenda" reasons I had for posting this "old" equation:

1) Shows how only WT, CID and AR are needed to estimate Fuel Economy (it's basically all about engine displacement and rpms).

2) Shows type (logarithmic) equation (product-of-powers): c = K*a*b*c

3) Shows quasi-cubic-root "power" for each variable: ie: WT^(≈1/3), CID^(≈1/3), AR^(≈1/3).

4) To provide *another* way to visualize/quantify how FE can be quantified...ie: "put into numbers"


...or, "rule-of-thumb" roughly: mpg ≈ 1900/(WT*CID*AR)^(1/3)