With premium fuel at $1.10 a litre, I'm keeping my cruise control set at about 115 km/h (70mph) for the most part. I did have the C up to about 140 km/h (85-90mph) briefly over the weekend, but that was just to pass a few stragglers.

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Jonathan

2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)