Have been doing a massive 20 day assignment in every direction of the island province I live in, and of course am keeping tabs on how much I spend on fuel. I have trip meter no1 set up to run over the whole 20 days, and trip meter two for each time I refuel to check on the mileage I get. I also once in a while check and see what my average mileage is (actually in kilometers per liter) on the dash read out.
With the Zard exhaust installed and a Bazzaz (commander type thingey) installed and tuned I was hoping to get a decent 20km/l (with stock exhaust I was getting up to 21). But it looks like I now average something like 18 km to a liter. Yet the fuel mileage indicator is telling me I am getting 20.5 . I was discussing this with my daughter's boyfriend who studied industrial design, and he reckons that because I have put on larger than stock tyres at the back that the trip meter is underestimating the distance as the tyre circumference is slightly larger than stock, and therefore I am doing slightly more kilometers than the trip meter reckons. But if that is so why would the readout for my average mileage per liter be so different? After all it's the same mechanism feeding the trip meter isn't it?
Anyone out there who knows about this?