More miles, first issue

More miles now, and a full tank so an opportunity to work out my mileage again. 

The first journey from full tank to full tank was 102.5 miles for 12.3 litres, which works out to be 38 miles per gallon. This fill up was 21.23 litres and it got me 162.8 miles, which is 35 miles per gallon. Given the first was motorway and the second was 'fun' it looks about right. 

Now the issue. Coming back home I got a clunk clunk under the car right under my feet. Everything seemed ok so I got home and had a look;

 The tensioner bolt for the alternator has decided to undo itself and escape. Thankfully it's just a standard bolt so I'll replace it with some threaded rod and some nylocs so it can't go missing again. Nothing else looked loose so I'm counting that as a win.

Oh yeah, and I forgot the main thing about an open top car... sunburn! My face feels like I've been in the sun for hours, I assume it's a combination of the actual sun along with the drying effect of the wind. 

I also want to look at a jacking pad for the rear. Something in the centre within reach of my jack would be ideal. At the moment it's going on one of the boot supports;

It works but it's sketchy and lopsided. If I put a bar or flat panel at roughly the same depth then that'll be a centre lifting point. With the jacks just ahead of them it works out quite stable;

The front should also get similar treatment although I don't have many ideas there as the front of the car hangs down too far for the jack to get under.