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Hi, the code is 20CB98 but with a custom 5th gear out of the 1.4 HDi engine which is 12.7% higher. I also have bigger tires. By the way, I will make an update regarding this because things changed on the car. I had 155/80 R13 (+5.7%) fitted but wanted to mount the nice Ecopia's 145/80 R14 (+7.4%) from the Audi A2. I have now exactly 45 km/h per 1000 rpm versus 37 originally, that is 21% more.
My goals have changed with the car. I don't aim anymore at super high mileages like 100 mpg or anything near that. Actually, I drive a lot faster (read : at PSL on country roads and 100 to 130 on freeway depending on mood and how in a hurry I am) and removed mods to make the car as civilized as possible.
To fit the 145/80 R14 was actually more motivated by the look of the tall and narrow tires than by the potential mileage gain. To fit them, I had to find 14" rims. I had some with 3x98 bolt pattern but they were to wide (5 inch) and stretched the tires too much. I found that some Peugeot 205 had as spare wheel an impressive 95/110 R14 mounted on 3 inch wide rims. Now 3 inch may seem too narrow for 145 tires but the beads are very narrow and the tire fits perfectly the 3" rim. Problem : the rims are in 4x108 bolt pattern so I changed the 4 wheels with parts from the 106 and Saxo. I eventually found 4 spare wheels removed the spare tires and mounted the beloved 145/80 R14 Bridgestone Ecopia. For the wheel covers, most don't fit because the rim as an offset in the middle, apparently so the brake calipers fit in the narrow rim. Even though, I have another version of the rim which hasn't this offset. Not talking about the ET here which is ET10 in both cases. So I drilled 4 holes in the rim and threaded them to screw anything I wanted. I choosed nice stock 15" inch covers from the Citroen C3. Look was more a concern than aero but they are actually quite full. I like also the low-profile tire look that is gives.
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