Fuel Shock & Commute Burden Simulator

The Macroeconomics of “Inexpensive” Fuel

Political leadership frequently characterizes energy price spikes as small sacrifices in international conflicts. However, economists track the Transportation Burden Index: lower-to-middle income households spend between 8% and 14% of their net income on transportation, versus less than 3% for the top decile.

Because commute demand has very low short-term price elasticity (-0.1 to -0.2), drivers cannot simply cease commuting to their jobs, forcing immediate 1-to-1 cuts in grocery, medical, or family savings budgets.

Physics of Speed & Aerodynamic Drag

Aerodynamic drag on an automobile increases with the cube of vehicle velocity ($P_{\text{drag}} \propto v^3$). According to Oak Ridge National Laboratory and the EPA:

• Cruising at 75 mph requires roughly 25% more engine power to overcome air resistance than cruising at 65 mph.
• Slowing from 75 mph to 65 mph yields an immediate 7% to 9% improvement in fuel economy on highway legs.
• Keeping tires inflated to specification preserves an additional 1.5% to 3.0% in efficiency.

Strategic Commute Defense Checklist

• Trip-Chaining: Group multiple errand trips into one warm-engine circuit to avoid cold-start fuel penalties (which burn 30% more fuel during the first 4 miles).
• Telework Prioritization: Shifting just one day per week to remote saves ~4.3 full round-trip commutes per month.
• Primary Vehicle Rotation: In two-vehicle homes, strictly assigning the higher-MPG vehicle to the longer daily commute eliminates up to $80/mo in shock margin.