Original sentence: Manufacturers have added car-level bumpers to reduce "submarining" in collisions- SUVs have therefore become somewhat safer for other road users in recent years
Edited sentence: Cars from the sixties have proven that it is possible to build a 5-seater with 625kg and the rising fuel price shifts the balance towards the use of lighter but more expensive materials (titanium, carbon fibre, magnesium).Low-energy vehicles being developed will bring down the fleets fuel consumption.Manufacturers are attempting to improve the SUV to address these criticisms.Manufacturers have added car-level bumpers to reduce "submarining" in collisions, and a full compliment of airbags are common.The most recent generation of SUVs have been designed to reduce the rollover risk with standard vehicle stability control.The smaller crossover SUV models are essentially station wagons or minivans with taller wheels and bodywork, and are not much worse than their counterparts in terms of fuel economy.Therefore, SUVs have become somewhat safer in recent years.Variants with low consumptions as low as 3l/100km (78 MPG) like the VW Lupo disappeared from the market because they were too expensive for such a small car