Sub-4 vs Hatchback, sedan, SUV, MPV

Sub-4m is a tax category: under 4,000 mm long with a petrol engine up to 1,200 cc (or a diesel up to 1,500 cc), taxed at 18% GST instead of 40%. 'Compact SUV' is a looser size label; axler8's survey uses it for SUVs under 4.4 m, which includes cars like the Creta and Seltos that are over 4 m and taxed at 40%.