1. I found the "range" remaining is only an estimate. The most I have ever filled up is 45L with 670kms. I say do not rely on it too strictly; it's better to judge how much fill you got left by the kms you have driven with that tank and form a habit to fill up at a certain amount of kms (mine was 600km mark). As everyone says, it's not good to drive until it's nearly dry. 2. Probably not. 3. 5W-30, 10W-30, 10W-40 4. Mine is about 5kms out at 100km/hr (using a GPS) but like Duy said above, it's standard practice for car manufacturers. 5. Just live with it. Just be glad you're not driving a Levin ZR, more beeps and noises due to the keyless entry. :)