Originally Posted by rvbuilder2002
I have done an extensive amount of cross country in the 14 and 14A and typically cruise at 170-171 Kts TAS at about 8.1-8.2 GPH
It is incorrect to think that a bigger engine automatically means higher fuel flow.
If you built two identical RV-7's except one having an IO-320 (160 HP) and one having an angle valve IO-360 (200 HP) and you fly them side by side in the same conditions, the IO360 airplane will have nearly an identical fuel flow as the IO-320 airplane when it is throttled back to match the speed of the smaller engine.
This is a very true statement. I would even go as far as saying that the one with the bigger engine may burn less. I took a trip to OSH 3 years ago with a buddy who flew his 7A and I was in my -7. He has a O-320 and I have O-360. Flying in somewhat loose formation, every time we stopped for fuel it took significantly less fuel for me to top off than for him because I had throttled back so much that my fuel burn was in the mid 6 to mid 7 range vs. his 9 to 10.