If you want thinner for cold weather 5w-40 is what you should look for.
Motor Oil Viscosity Grades Explained in Layman's Terms
We have full synth 5w-40 API SM/CF, ACEA A3/B3/B4 for £5.60/L here.
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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