Like me I'm sure there'll be quite a few of you with a Cactus shod with Goodyear efficient grip, if so you might be interested in my recent experience.
It turns out Goodyear have revised (improved?) the tyre and it is now known as the "efficient grip performance". There will still be some stock of the efficient grip (eg) out there but essentially you will be offered the efficient grip performance (egp) if you need a replacement.
Having recently had a rear right puncture which meant a new tyre I was given an egp but this resulted in the car pulling to the right. After checking the tracking the problem persisted. Decided to replace the perfectly good eg on the left with another new egp and the problem was sorted, the car kept a straight line.
My conclusion is that the new egp does not mix well with the old eg on the same axle. Before sorting it out I did speak to the Goodyear technical desk who commented at one point that the new design has more pliable sides than the old, so I now wonder if that's why the don't seem to mix. They made no comment about mixing them on the same axle.
It turns out Goodyear have revised (improved?) the tyre and it is now known as the "efficient grip performance". There will still be some stock of the efficient grip (eg) out there but essentially you will be offered the efficient grip performance (egp) if you need a replacement.
Having recently had a rear right puncture which meant a new tyre I was given an egp but this resulted in the car pulling to the right. After checking the tracking the problem persisted. Decided to replace the perfectly good eg on the left with another new egp and the problem was sorted, the car kept a straight line.
My conclusion is that the new egp does not mix well with the old eg on the same axle. Before sorting it out I did speak to the Goodyear technical desk who commented at one point that the new design has more pliable sides than the old, so I now wonder if that's why the don't seem to mix. They made no comment about mixing them on the same axle.