I expect to be shot down in flames but I don't mine one bit. I have just done a bit of a drive in my 28 year old Nissan Bluebird Wagon about 10% city 90% HWY....NO Fancy EFI systems or direct injection here just a plain old carburetor running slightly rich at idle. I just did a rough distance calculation on whereis.com ...308 Km on 18.23L of fuel that's about 5.9 L/100 km and have 2 other people in the car and with tools and baggage. I will fine tune the mileage later on but I filled up at Warnbro then to Subiaco to Kenwick to Armadale then filled up at Wagin. I put in 1/2 a tank of 98 octane as well but this would not account for such an increase in mileage. Also the Elevation of Wagin is 303 m and the elevation of Wanbro is 20' so I was going uphilll slightly as well over the journey. I have receipts which I can scan later on if needed. My car is rated somewhere around 11 L/100 km on the HWY. But if its impossible then how did I do it? Poll options 1. False=You cheated some how. 2. True=I believe the figures. 3. A 20L jerry can topup. 4. Fill up half way on the trip with cash. 5. Would MythBusters buy my car and test it. I will be doing some more trips soon and will keep more records. I know I need to pull the engine out and put it on a test bed but at the moment its the only licensed car I have. I guess I would need a professional 12 V video camera and mount it so it had a view of the road and the fuel cap and could record for length for 14 to 16 hours or maybe a cheap web cam to start with.