Mga tol!

Posible kayang pakontiin ang fuel consumption ng Nissan Vanette? I just owned a '96 model Vanette, so far ok naman lahat pero yun nga lang, sobrang aksaya sa gas. Minsan, lumalamon ng 5km/liter. As in talagang butas ang bulsa ko. So do you think it's possible? If so, how? Is it tested na to be effective? And ano kaya ang side effect nito?

To those vanette owners, how much is your average fuel consumption? Sa'kin kase is 5km/liter.