Before you dig into the SDi frugality, don't forget they have a fragile gearbox - shared only with the 1.6 Petrol (and we know how popular they are) and not the same as the TDi. Plus the gearing is lower so as well as being very very very very slow they are also noisier and thirstier than they need to be.
A quick Autotrader search with 10 miles and £1k max price brings up quite a few. How about a Vectra DTi (the good one with an intercooller) or how about the minicabbers old fave the 406 - there's a 1999 facelift estate HDi with 110K miles on it near me.
If you want a bit of go and some reasonable modern-ness how about a late-ish 1.4 HDi 206 ? Or even a 2.0 ?
2001 PEUGEOT 206 DIESEL 3 DOOR
£675, although the ad doesn't give mileage so I suspect its been to Mars and back.
Quote:
Fuel consumption (urban) 48.7 mpg
Fuel consumption (extra urban) 74.3 mpg
Fuel consumption (combined) 62.8 mpg
0 - 62 mph 11.7 seconds
Top speed 112 mph
Cylinders 4
Valves 8 v
Engine power 90 bhp
Engine torque 154 lbs/ft
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EDIT - I would also skip LPG, adds weight and you need to do about 18K miles to get your money back. Plus your iS will be worth more kept in original condition.