I've read a number of discussions about whether to burn Regular or Hi Test gas in the ES350..... Thought you might be interested in this week's test.....
I drove from Raleigh, NC to Milwaukee and return this week - - 1000 miles each way - - got 31.4 miles to the gallon on the way up using regular (87 Octane) gas.... Cost @ $4.00 per gallon = $127.39....
On the return trip I burned Hi Test (93 Octane) gas... Same route.... Same speed (72 in a 65; 77 in a 70 zone).... Cruise on all the way....
Got 33.7 miles to the gallon on the way back using Hi Test (93 Octane) gas..... Cost @ 4.25 per gallon - $126.11 - -
Therefore I actually saved $1.28 using Hi Test.... :P
I've been burning Hi Test all along so I guess I'll stay with it now that I've run this real life test....
JohnJ