2alpsade said:Alpina D3 (single turbo) has a similar power output and economy as the 123D, but in a better body, and with a few tweeks to keep things interesting. Can be had from about £13k, and look the bees and I would take it over both the options above. Insurance is reasonable, too, as are running and service costs. My D3BT gives 45mpg, and real-world D3 numbers are in excess of this. Both beat the pants off a 320d Msport for ride and performance, and the 1-series is fugly, and cheaply built in comparison to a 3.
Beat me to it,
I do 800-1000 miles per week in my D3BT, if I'm steady on the motorway I can get around 45mpg, but if im around and about at the weekend it drops to about 38mpg.
tomTVR said:Just done some calculations for you based on:
13,000 miles PA
Z4 coupe averaging 32mpg
123d averaging 55mpg
diesel costing approx 5ppl more than petrol
You would be better off by £900 a year in petrol and another £100 or so saved on tax so call it £1,000.
Which in my opinion is easily a price worth paying to own a 265bhp 6 cylinder work of art compared to a 4 cylinder 1 series (albeit a nippy one)
BUT there are other things to consider. If you trade then you have to take a hit on trade-in AND pay the dealer markup, so you get stung twice which will probably take 2 years to recoup in fuel savings.
The 123d will probably lose more in depreciation with the added mileage because its a newer car and the E86 is a future classic.
By many accounts i've read the 55mpg is a bit optimistic, try knocking off 10mpg to get a realistic average. This is caused in part by a very low ratio differential which aids acceleration but revs too high at motorway speeds = poor mpg. On the other hand the N52 3.0 petrol 6 tends to be pretty much bang on the book figures.
Depending on how long you keep it, the complicated twin turbo diesel will have more potential to give you trouble in the long run.
The 123d is an excellent car, I've considered one myself recently since becoming a father I need to think of something more practical. However to me the sums don't add up. I'd keep the Z4 or get a 120d instead, it's only 27bhp down on the 123d but miles cheaper to own.
tomTVR said:Z4 coupe averaging 32mpg

bigshurv said:Keep the Z and enjoy the drive to work. For the difference you are going to spend, you can buy a lot of fuel.If you change to a 1 series diesel, it will always only be a 1 series diesel.
MigsAngel said:bigshurv said:Keep the Z and enjoy the drive to work. For the difference you are going to spend, you can buy a lot of fuel.If you change to a 1 series diesel, it will always only be a 1 series diesel.
Totally agree, i do 70 miles round trip daily in the Z4M coupe....I got rid of an e39 M5 for the Z4M....but the M5 was a huge petrol eater....Love my M Coupe!
NikB said:I would like a flappy paddle box but I understand that you lose the stop/start function
Wondermike said:NikB, yes you lose it with an auto 123d as you say. Newer cars - they seem to have managed it. Not sure you'll miss it anyway.
NikB said:Looks like I'll be keeping the car for now anyway as there isn't enough equity in the it to make a sale worthwhile. Thanks for the advice everyone.