I have used all 3 extensively.
BP is 0.5 miles up the road and it gave me record tank mileage of 327miles brim to light .
Shell is now a penny cheaper but requires a detour after gym into traffic , car is slightly more responsive but it barely does 300 miles to a tank
Tesco is 5.5miles up the road but is about 13p cheaper than shell (went at weekend)
, no difference in performance/response with my butt dyno and will do over 300 to tank easily along with being better on wallet .
9.5/10 its got shell in it
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