Only four motorists were prosecuted for fuel-gauge offences last year, down from 17 in 2012 and 14 in 2011, said Singapore Customs in its annual statistics report out on Thursday.
The agency attributed the drop in the number of offenders being charged to a rise in awareness about the penalties that the offence attracts for those who flout the three-quarter-tank rule.
Singapore-registered motor vehicles departing Singapore via land checkpoints must have at least three-quarter tank full of motor fuel in the supply tank - this includes petrol-CNG vehicles.
If a motor vehicle does not meet the rule, the driver can be prosecuted in court and fined up to $500. If the fuel gauge of the motor vehicle has been found to be tampered with, the driver will also be charged in court for illegal alteration of the fuel-measuring equipment and if convicted, liable to a fine not more than $5,000 and/or jailed for not more than 12 months.