Hello from Australia

I have a 2007 Honda Fit, known as the Jazz here. We have 2 engine options, the 1.3 litre and 1.5 litre. Mine is the 1.5 litre. I am averaging 39 mpg. This is in US gallons - 3.78 litres, not imperial gallons - 4.55 litres. I have the automatic CVT transmission which helps to keep the revs low. Most of my driving is half highway (55 -62mph) and half light urban (31 -37mph).

I have a litres per 100km gauge with the odometer and it goes up to 6.1 in town and the drops back to 5.8 after a stint on the highway. It averages at 6 which converts to your 39mpg. I have compared these readings with odometer readings and petrol purchased and they are accurate.

If I'm on the highway cruising at 62 mph and reset the fuel economy gauge I can get a reading of 5 litres per 100 km which converts to 47 mpg.

Back to the CVT transmision, which stands for continuously variable transmission. I wont try and explain how it works - thats what google is for, but it keeps the revs at the lowest needed to accelerate and maintain speed. This is a big factor in good economy. Most of the time I keep the revs under 2500.

Of course you have to drive smart. Watch for lights changing, stay in the left (your right) lane in most cases. Don't be bullied into speeding by agressive drivers, easy on the throttle.

I live on the Sunshine Coast in the state of Queensland (think of Fort Lauderdale for the southern hemisphere) and air conditioning is a must for 8 months of the year. This usually adds 1 litre per 100km to the usage which brings the economy to 33.5mpg. It's a sacrifice but I'd rather keep a cool head, especially in traffic.

Enough from me, have a good day.