Fleet Fuel Efficiency & Consumption Trajectory (2026–2035)
Hover or tap across years to inspect fleet-average MPG and national gasoline burn.| Model Year | Fleet Avg (mpg) | Rollback (mpg) | EV Share | Annual Gas Burn (B gal) | Annual Gas Saved | Annual Consumer Savings |
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CAFE vs EPA Dual Regulation
Under the Clean Air Act (EPA) and Energy Policy & Conservation Act (NHTSA CAFE), automakers face dual standards. Relaxing or gutting these rules removes civil penalties for gas-guzzling light trucks and removes multi-year electrification incentives.
Harmonic Mean Fleet Math
Fuel economy standards are calculated as a sales-weighted harmonic mean ($1 / \sum (f_i / \text{mpg}_i)$), meaning lower-efficiency SUVs heavily penalize automaker compliance unless balanced by zero-emission or hybrid powertrains.
Macro Consumer Tradeoffs
While rolling back regulations may lower upfront retail sticker prices on conventional engines by $900–$1,400, it raises total lifetime ownership expenses due to extra gasoline consumption over the vehicle's 12–15 year operating lifespan.