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Yeah likely mazda, ford caused all sort of cross vehicle contamination lol.
Tbh I've never found a 1.6-2.0 petrol in a regular car that is any good on fuel, all gutless. Did well with a vag 1.4 tfsi, and the mote recent eco boost engines that ford have. Weirdly used to have a 2.0 ecotec era turbo saab 93 with some mods that was more economical (almost all of the time) than any 1.6/2.0 na I've used.
But! Often simple engines that for purpose of chugging around towns are reliable as such, yes they use more fuel, but could be argued cost less overall.
Do you know 'owt about the heritage of the 1.8 16v petrol in the V50? I think I read somewhere that it's a Mazda engine? Mine's from 2009. It's fairly weak and, although the claimed 38mpg isn't exactly amazing, it does genuinely do that after 74k. Think it might be this: https://en.wikipedia.org/wiki/Mazda_L_engine