I never fill my tank up completely. (Tank is in the floor) I watch my gauge and when I'm almost full I stop at the nearest complete gallon mark on the pump. (I also have an app on my phone that tells me the proper ratio of oil to gas). I then look at the app, punch in the amount of gallons of gas I just put in and the app tells me the proper amount of oil at 50:1 to add. Then it's just a simple matter to put in that amount of oil into a gallon gas jug, add a little gas to dilute it further and then pour it down the fill pipe. Always the right mixture every time. Easy-Peasy-lemon-Squeezy
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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