Really don't understand why this is such  big issue that you would put someone off buying the vehicle. Could'n't really care less if the fuel tank was 50l or 150l. Range is all that matters and i'm averaging over 700kms to a tank.
I mean if you'd prefer the false fuel claims from the LC200 which has owners averaging up to 15l/100kms with a claimed 10l/100km then fair enough. Just don't forget to pack a 5l drum of oil as it's a bonus if you don't go through one once you hook a trailer up.
Let's face it, they all talk up figures... VW's emissions scandal is a classic example.. In fact if you refused to buy from a manufacturer who doesn't have at least one false fuel claim in their line up right now the only vehicle you would be purchasing would be a Tesla.
"The diesel engine is a cracker of a unit, doing a great job of shifting some 2.7 tonnes, all the while using around 14 or 15 litres of fuel for every 100km of everyday driving (the official claim is 10.3L/100km)." Now that's something to be ****ed about.
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