I always use premium fuel and if you rev it up its pretty nice across the range. The problem with the jtd is the power delivery isnt even so in the real world its not as pleasant to drive despite being more powerful.
re-map and de-cat down pipe cures that..!
I have no lag whatsoever and the power delivery is smooth and linear from 1st to 6th...its a different drive I grant you and a more powerful petrol engine would be the best situation to be in, but currently in the world of Alfa a more powerful petrol means a 6 pot which means either a JTS in the brera or a busso in the GT.
here is the problem..the Busso gives terrible fuel economy, my commute is/ was (I just left that job) 650 miles a week. forget the Busso, £140+ a week in fuel and lets not go into what else can go wrong with that car at that weekly mileage. It shares all of the suspension frailties of my JTDM without the fuel economy or lower road tax to balance it out as well as the oil cooler corrosion issue, however if my yearly mileage as 10k I would have got one.100%.
now onto the brera, heavy,heavy,heavy! kills fuel economy in any engine choice...when you compare the figures of the 2.4 jtd in the 156 compared to the same engine in the brera, that tells the whole story. in addition the extra weight makes it a less than exciting drive...looks great and is a more solidly built car but doesn't feel like an Alfa to drive.
I really wanted one after my JTS GT got written off in the work car park, but after driving several brera's (3.2 JTS,2.4,jtdm and 2.2 JTS) I was dissapointed with the handling, so ruled it out of the equasion.
I then drove a 3.2 GT (best of the bunch but £500 road tax and aforementioned economy) and 2 more petrol GT's a 1.8 twinnie (underpowered) and another 2.0 JTS. and then......
finally begrudgingly I tried the JTDM blackline I currently own, after speaking to loz at autolusso about the re-mapping and suspension upgrades it was an easy choice, even in stock form it felt faster than the JTS. Now with my 210 bhp remap, eibach arb's ,quaife,and bilstien suspension its a monster! pulls like a train in every gear and gives me around 55mpg, more on a long run..road tax is £200 a year and due to the egr and swirl flap delete I have none of the problems associated with a diesel car.
the one down side is at idle it sounds like a bag of spanners!, I can live with that given all of the advantages.
on balance if you want economy and performance the JTDm is the only sensible choice.