Yeah, but Jet A1 fuel has a higher density, so if you consider a full tank, then it would be heavier than the equivilent C172 filled with AvGas.
i dont think the mod for the PA28's been approved yet.
In December, CAA approval was expected "in the first quarter of 2003". Haven't heard any update on that yet, but Meridian Aviation bought a 1980-PA28 Warrior and converting it as a demonstration aircraft.
Also, I said in my last post the price was €40,000.
Looking back, there was an article that said £40,000 if I remember correctly.