If I had a 2.5 litre (Or whatever size that's close to that) diesel manual caravan the size of the one I've been driving I think I could manage 29 per tank easily even without EOCing, I'm already getting 24 easily in a gas engine with an auto transmission. Add a little EOCing and there's already 35.
Come to think of it 35 wouldn't be unheard of in a 90s whale station wagon if I stuck a Diesel engine and Manual tranny in it and added LRR tires. But, I don't even have such a car on this day in December 2013, I'm just observing it.
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