NEW DELHI: A little over one-fourth of drivers in India know how to use GPS to ascertain the best route before starting a drive and nearly four in every 10 don't know that harsh accelerating and braking negatively impacts their cars' fuel consumption, a survey has found. Nearly one-fourth believe that keeping the engine running while idling will save more fuel.The findings are interesting considering that 95% of Indian drivers surveyed by automobile major Ford Motor Company claimed that they knew how to drive their car for maximum efficiency and 96% said they made efforts to drive efficiently.The survey, conducted across the Asia Pacific , covered 9,500 respondents and 1,020 drivers took part in India.