hi guys....can any body tell me the difference between an american gallon and a uk gallon.. reason i,m asking is,...when i bought my rv, off winnibago, it said in the brochure,that it done about 12 miles to the gallon. but ive been told that the uk gallon is bigger than the u.s.a. one. if that is so,then i,m getting more than 12 miles to the gallon......is that correct. it has been said that i,m getting about 17 mpg....and the chap who claimed this who will remain annoyminos for now....i tend to beleive him..he stands by this...dont you roger....now before you answer.i went to caterpillar in cannock, and they road tested the vehicle,on the m6.motorway, and claimed that at 75mph,my engine was using 5,7.ltrs an hour....and at 54 mph, 5.9 ltrs an hour. so slower you go,the more you use, when i questioned it with the testing guy, he said, these engines are designed to perform at there peak revved out.....so what do you reckon,...am i getting more mph for my buck, (euro dollar)or is it a load of bull.