Just wondered if anyone had found their MPG decrease upon fitting larger rims. I've fitted 11 spokes to both mine and Dad's tourer. Previously mine would run on a combined average of 43-47 mpg, this is now down to around 37 since fitting the new wheels.
Now my understanding is that the larger wheels will make the gearing longer, but the great rolling resistance will counteract that to some extent.
Previous tyres were: 215/50/17
New tyres/wheels are: 225/45/18
Would be grateful to hear what people have found.