China's 106 MPG Engine Just Broke a 100-Year Rule

Geely's new 1.5-liter engine turns nearly 48% of its fuel into useful work — a figure that quietly rewrites a century of engine design. That efficiency drops a full-size sedan to 2.67 liters per 100 km, or roughly 106 miles per imperial gallon on the combined cycle. This isn't a lab curiosity or a one-off concept car. It's the Galaxy A7 EM-i, a mid-size sedan built for ordinary drivers. In this video we break down exactly how China's engineers pushed a combustion engine past the thermal-efficiency ceiling most of the industry called impossible — from the ultra-high compression ratio and Miller cycle to the hybrid architecture that lets the engine run only in its sweet spot. We'll cover why 48% thermal efficiency is such a big deal, how it compares to Toyota, VW and the best Western engines, what it means for fuel costs and emissions, and whether this changes the timeline for the electric-vs-combustion debate. Numbers, physics, and manufacturing — no hype, just how the machine actually works. If you love megaprojects, manufacturing, and the engineering behind the machines that move the world, subscribe for a new deep dive every week. ⏱️ TIMESTAMPS 0:00 The 106 MPG claim 1:15 Why 48% efficiency breaks the rulebook 3:20 Inside Geely's 1.5L engine 5:40 The Miller cycle & high compression 7:50 How the hybrid system hides the weakness 10:15 Geely vs Toyota vs the West 12:30 What it means for fuel, cost & emissions 14:20 The bigger picture for the car industry #Engineering #ChinaTech #CarEngine #FuelEfficiency #Megaengineering 💬 Do you think Western automakers can catch up to 48% thermal efficiency, or has China already won the combustion-engine endgame? ━━━━━━━━━━━━━━━━━━ SOURCES ━━━━━━━━━━━━━━━━━━ ▸ CarNewsChina (June 19, 2025) — Geely officially unveiled the Galaxy A7 EM-i as the debut vehicle for the Geely EM AI Super Hybrid 2.0 system, built on the GEA platform. ▸ CarNewsChina (May 28, 2024) — BYD's fifth-generation DM system, used in the Seal 06 DM-i and Qin L DM-i, pairs a 1.5-liter 74 kW engine with a claimed fuel consumption of 2.9 L/100 km (NE… ▸ Associated Press (July 10, 2026) — China exported approximately 905,000 passenger cars in June 2026, an 80% increase year over year, while domestic passenger-car sales fell 26% over the same p… #Engineering #ChinaTech #CarEngine #FuelEfficiency #Megaengineering #Engineering #ChinaTech #CarEngine #FuelEfficiency #Megaengineering