Hi Jim, welcome to Fuelly. If you click the "research vehicles" link at the top right, you'll be given a list of every vehicle listed on fuelly. If you have a certain truck in mind, simply find it on fuelly, then you can filter the results for various engines etc. You should get a good idea of the gas/diesel comparisons. I would choose diesel whenever economy is concerned, however I hear diesel is up to double the price of gas, so it may not make as much economic sense on your side of the pond
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