Interesting question mate...and over time I should be able to answer it. The carwings setup records each journey and average economy, so I should be able to compare pre and post suspension change once there is a decent amount of average data This setup is 30% lighter (and you would normally count half the suspension as "unsprung") and 30mm lower which would both normally help economy. But the interesting thing is, pretty much everyone is interested in the range and impact on range of doing things to this car. If you take a step back, who here has ever thought twice about fuel economy before changing shocks? or an airbox, exhaust, cooler etc etc. To me the car can be improved for my preferences by modifying it instead of sticking with the factory compromises. If I have lost 1-2klm (1%) of range from any given change it is kind of irrelevant. I am more concerned about when I change the tyres from eco to grippy ones, that could have a 5 or maybe even 10% impact. I suspect I will get less range now because it is much more fun to drive fast