[2001 ZTS]

It is the Focus. I have been running 89 since the mods went on this summer.

It's is not deto in the sense of "marbles in tin can" it is more of stumbling?knocking (which I know from the old car) sounding/feeling thing like it was going to stall despite going 120km/hr and 3000rpm. It was happening on the QEW only under acceleration and hills which is usually means deto/fuel.

I think it is just a tank of "bad gas" (dirty, old, moisture, whatever). I've got 25 Litres of 94 mixed in now so should be OK. I'll see on the return trip this PM.

I've learned a bit about gasoline this year. For one thing 87 may be enough octane but it is absolute filth. As a matter of fact what you buy as 87 may in fact be 89, 91, 94. If there is an error in the production of a batch of high octane it just gets sold as 87. It happens a lot.