Hey everyone. I've been driving my (new to me) 2011 Lotus evora for about a 6 days now and I noticed that the estimated MPG on the little side screen doesnt match how much fuel im using. Ive been hesitant about opening her up so Ive been stay pretty much under 3k rpms which is showing me an ~18mpg which seems about right. However I can pretty much watch my fuel gauge lower itself throughout my drive home from work. This is my first tank of gas (Shell vpower nitro) in the car and its only gonna get me about 180 miles before empty. With ~18mpg I should be getting over 250 so what could be wrong?