no, thats 20 gallons of total, presuming your e85 is actually e85, 5 1/2 gal of e85 with 14 1/5 gal of 91/93 nets you pretty much e30. a 10 gal to 10 gal ratio of e85 and 91/93 will get you e47/48
if you have a fresh tank 36 gal of 91/93 and you are filling your tank up, put 10 gal of e85 in for the first time and the remaining 26 gal of gas is 91/93, nets you e30
Once you have e30 blend established, at a 1/4 tank, or 25% according to the ford pass app, put 7 gallons in of e85 and then top off the rest with 91/93 will net you e30 plus of minus a small % depending on your e85 content (my local station always sits roughly at e82
I use a bottle tester for the content from amazon when testing either the e85 from the pump or my tank and a simple test kit, process to get the exact ethanol percentage right from the trucks tank in less than 2 min to test total ethanol after the fill up....
the ford pass app, % of fuel in tank and a app off the phone has been 98% accurate for the past 3 years ......... only variance is if I go too many fill ups without testing the e85 content at the pump, will throw you off 1-5% plus or minus.