G'day All.
I've had a jump in fuel economy in Zed over the last two tanks that has me wondering why.
My 3 tank average was 21.13mpg, then I put an old pair of tyres on the front of my car halfway through the next tank.
That tank returned 22.17mpg, a 4.9% increase and my best tank up to that point.
My latest tank (first full tank with these tyres) returned 23.18mpg, a further 4.6% increase, for a total of 9.7% from the old average.
These tyres still have lots of tread but the rubber is well cured (hard), could the rolling resistance have decreased as a result? Could it make that much difference?
Please understand, these tyres aren't unsafe. I can still push hard through a roundabout without under steering.
