Did a 870km highway trip today; based on the fill up and fuel gauge, it would have been about 28L total, 3.2L/100km, >70mpg! The odometer seems to read about 2-3% high with the new tyres (that match factory outer diameter). This was with the rim spokes taped over and the rear wheel well gap filled in with some corflute. No drafting, but I did go 10kmh under the limit! I have access to a lot more tools here, so should be able to make the mods more permanent and get the undertray done finally, I'll probably put any future updates in a thread specific to my car now it isn't stock.
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