I have a question for those who calculate tankful to tankful. What is your definition of tankful? The point where the fuel meter cuts off automatically? is that a reliable method? I always ask the attendant to make the amount a round figure, so haven't been able to do a tankful based calculation. Any pointers would be useful.
I use auto cut off at the pump. Till date I have filled up six tanks in my Alto K10. As I use credit card, fractions do not matter.
I have yet to hit highway, and on short marketing trips since I bought the car I have got between 12 and 15km/l. 90% of my trips are 1/2 to 2 km one way, with AC on most of the time. When ever I can get the space I rev the engine to 5000 rpm+.
Indica Vista Quadrajet:
City: 14 KMPL with around 70% AC
Highway: 19KMPL with no AC and speeds touching 140 KMPH
An OT which I would like to mention here:
Considering that auto cuto off during refuelling has been mentioned here, I would like to enquire if any one has seen siginificant differences in mileage when auto cut off has been followed v/s when it has not been followed.
My personal experience on my car is that irrespective of my tanking up either way, I have not noticed any change in the FE.
AC always on.
80% NCR and balance 20% on so called highways.
Never resetted the MID till now
Noticed highway milage between 16 to 22 kmpl between steady speeds of 90-100
City milage varies between 3.4 to 12 depending on the road and gearing.
Checked MID many times and found it to be very accurate.
Many times here in Maharashtra, petrol pump guys fill the fuel after the auto cutoff as well. Recently also i filled the Petrol till tank is full i.e. almost overflowing. It was pipe full as well.
Here i have seen some commercial vehicle people fill diesel after tank is full. They will shake the vehicle so that some extra fuel can be filled
True, even I have observed this in Mumbai.
I work as an Internal Auditor for a Speciality Chemical firm based out of Mumbai. They manufacture chemicals to extract other products from crude. Here's an interesting fact shared by the GM Production (narrated in layman terms):
As of date, the fuel pump mechanism has improved to a great extent. After the pump auto cuts off and when one tries to push in more fuel, the pump has a tendency to 'hold back' fuel which is being dispensed in the cars fuel tank. Rationally, the fuel pump meter is running while the fuel pumped is not in sync with the meter reading (ouch, not a good news with the recent fuel price hikes). So it is highly advisable to 'stop' right there.
I used to top up my cars fuel tank to the brim till I heard this and have given up on the method since then. I now stick to auto cut off.
PS: The above information is acquired from a person in the Petroleum industry. Since I am not a chemicals guy, I absolutely have no idea whether this holds true. Maybe chemical guys from the forum can verify this and correct me if I am wrong !!!