Thank you for your advice. For me the performance is fine if I could get a map that would give me better fuel economy that would be great
Am I right in thinking that your user name suggests interest in old-school Citroens as well as A2s? As above - welcome!! We're a broad church.
From experience of locally-derived as well as external remaps, I wouldn't say there is one that necessarily reduces consumption - a lot of that will depend on how heavy your feet are. What I would say is that in my experience - the consumption is no worse despite the potential performance increase possible with updated software, and the enhanced maps can give better flexibility once you're above the 1950-2000rpm step up in the torque curve for the 75tdi. Overall maintenance condition is probably a more critical thing - obviously regular fluids and filters is never a bad thing - and as mileage rises, likely that getting the injectors refurbished will contribute to smoother / more efficient running - I know that this was obvious with my project car getting the injectors replaced and the followers calibrated when reinstalled at 290k eliminated smoke, lumpy idling and occasional 1-2 seconds of uncontrolled revving on startup.
Worth also looking at wheels / tyres - lighter variants of these will help. People here swear by 15" Pepperpots for the lightest combinations although they aren't the easiest to come by and there are some others (from the A1?) that may be pretty close and easier to obtain.
Eventually long 5-speed or 6-speed gearboxes give potential to give cruising gears for long motorway journeys although again (with 2 6-speed conversions) the efficiency gain is minimal, where the bigger outcome is considerably more restful cruising on 4-500 mile motorway journeys the length of the country for 8-9 hours at 2050-2100 instead of 2800-2900rpm. And you do need a remap to push the longest ratio. The JDD / extra long 5-speed option has its proponents but there are some specific niceties about the 4th / 5th gear that can mean it is more suitable for some users than others based on local topology and driving requirements.
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Perhaps the most cost-effective option for long distance fuel-efficiency up front after a good service would be OEM cruise control so that the computer is controlling the throttle versus speed requirements - I got this installed by
@timmus a few years ago and it has been a godsend for the above regular country-length drives.