Four Wheel Logic

Engine coolant does go bad over time; age, heat, and contamination weaken its protection and call for regular replacement.

Yes, electric vehicles have transmissions, usually a single-speed reduction gear instead of the multi-speed gearboxes used in gasoline cars.

Most electric cars do not use engine oil, but electric car drivetrains still rely on gear oils, coolants, and brake fluids that need occasional checks.

Most electric cars use a single-speed reduction gearbox, with multi-speed units reserved for rare high-performance models.

Most electric cars use a single fixed reduction gear, with a few high-performance models adding extra gears for speed or towing.

Yes, economy mode can save gas by softening throttle and shift behavior, but gains are modest and depend on traffic and driving style.

Yes, eco mode usually saves gas by softening power delivery and trimming energy-hungry features.

Yes, E85 burns faster in the engine and through the tank than regular gasoline because it has higher flame speed but lower energy per gallon.

Yes, driving slower in the 40–65 mph range usually saves gas by cutting aerodynamic drag and extra engine work.

Yes, driving faster usually uses more gas because higher speed raises drag and makes the engine burn more fuel for each mile.