Fuel economy

Silicon Valley Invades Your Engine

Tula has developed software algorithms that do something engineers in Detroit, Tokyo and Stuttgart had not thought possible—to shut off different cylinders independently, giving the engine power as needed in a given situation, but saving fuel by giving it only the power needed and not firing any extras cylinders.

Road Test: 2016 Hyundai Sonata Hybrid

Criticized for its previous hybrid’s middling fuel economy, Hyundai engineers meticulously rethought and re-engineered the hybrid system that casts aside that criticism. The 2016 Hyundai .Sonata Hybrid SE now has an all-40 MPG government rating

First Drive: 2016 Nissan Titan XD

Nissan came up with is a truck midway between a half and three-quarter ton, added a brand-name diesel engine for power and towing, and hopes the 2016 Nissan Titan XD will appeal to many of those 150,000 who want something more than the small pickup and not as much as the larger one.