4 whopping cylinders on Toyota RV's. Talk about great getting good MPG. Also I have a very light foot on the pedal. I followed some MPG advice on Livingpress.com and I now get 22 MPG! Not bad for a home on wheels.
I used it on our 94 Bounder. Didn't use any eternabond as there were no leaks at the end cap seams. Just applied it up over the seams. Is messy but works great.