you want notice to much of a difference with the fuel tank foward..cg the plane with empty tank and it will be fine.i thought the same thing when i started fuel planes,but there is not much difference except fuel planes do fly different..you may want it just a tad nose heavy with full tank if you fly your tank real low.this engine uses so little of fuel you will usually have half of tank left with even 15 minute flights on 8 oz tanks..main thing keep cg within reccommended specs..