Arias Pistons 12.5:1 Compression 82mm Bore Honda B-series on 2040-parts.com

July 17: A mystery and a helping hand

Driving very conservatively, at about 55 mph, I made it the 76.3 kms (47.3 miles) using only 9 kWh. That's 5.25 miles per kWh. That's also 8.5 kms per kWh.

Porsche Panamera Convertible coming

Porsche are planning a 2 door Panamera Convertible That new Porsche 928 now looks an even more likely possibility after Automotive News reported that Porsche are looking to make a convertible Panamera. But it won’t be a four door convertible, but a two door. The report says that is to help with rigidity (we buy that) and to keep weight down (yeah, just like they have on the saloon), but what it does mean is that Porsche could easily engineer a fixed-roof, shortened Panamera to create a high-end GT in the style of the 928.

BMW M4 Convertible revealed. Price from £60,730

The BMW M4 Convertible (pictured) revealed We reported last month that the new BMW M4 Convertible would debut at this year’s New York Auto Show, and here it is ahead of that debut complete with trick folding metal roof, 425bhp and a price tag that just nicks over the £60k line. A direct replacement for the old M3 Convertible, the M4 Convertible will cost you just over £4k more than the M4 Coupe, but for the extra money you get the same car but with infinite headroom – and a big weight penalty. The new 3-piece metal folding roof can be tucked away in a mere 20 seconds at the flick of a switch, with better noise insulation than the M3 Convertible had and more room in the boot when the roof is down too.