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My Grandma's Opel Corsa C 1.0l was aimed at better FE and had narrower OEM tires than other versions. Their size was 155/80R13, but I don't remember the maker, model, etc., except for 'LowCO2' markings on them. Whether they really are low RR - I don't know.
EDIT: I looked at a tire size calculator and it said that the diameter of 155/80R13 is only 3mm less than 175/70R13, that's 0.5%. Going to thinner tires will definately reduce your FA, but you should check the weight limit on them.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
Piwoslaw's Peugeot 307sw modding thread
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