heidihidin

i know there are many threads her on this topic
i am looking specifically for input from those who have an early year 5th gen with over 100k and mostly drive interstate

thanks

12jimmyjam

igzy

I am getting 26-27-ish when driving purely interstate...

heidihidin

nice what grade gas?
anyone using 93+?

12jimmyjam

igzy

Nope, this is on the cheaper 87 octane

However, last week I filled up a full tank at Target's gas station and drove it to almost empty about 90% on interstate and it averaged only 24. This is waaay below what I would get with 90% interstate, it would be 28+. Fill up after that was at my usual station and it is now at 27+ which makes me think that the gas at Target was different than usual. It probably had more ethanol than what my car usually gets, hence the decrease in mpg...

heidihidin

hard to believe that poor gas will cause 3-4 mpg but it's probably true
makes you wonder what does Target in this case do to their gas? dilute with water?

igzy

Actually wouldn't be water but likely extra ethanol. For regular gar engines, i.e. ones not programmed for high ethanol, if the ethanol % goes up then the mpg will go down by almost equal %. In my case it went from 27 to 24 mpg, about 11% drop, so it is possible that gas has ~10% more ethanol than my usual gas pump...

I don't mean to slam Target here. This was in Buffalo, NY and every pump is supplied locally from whatever source, and ethanol mix varies across the country...

geopig

Been doing a lot of highway driving over the past year and getting 32-33 mpg using 91 octane. '07 with >160k miles on it. I posted before on some anecdotal evidence related to mpg difference between regular vs premium here:

https://www.clublexus.com/forums/es-...us-2gr-fe.html

Basically is a roughly 10% drop in mpg using lower octane fuel but where I am I get the higher grade fuel for 10% more cost so it's a wash here in Ottawa, Canada. My wife just did a trip from western Wisconsin to Niagara Falls at the end of August and used 87 octane since the cost of higher octanes was a lot more than 10% and still ended up getting 30 mpg on that trip.

igzy

Yes, I was one of the contributors in that thread My study showed basically, strictly looking at $$$, any mpg gain was negated by the higher price of premium, at least here in Canada...

Note that premium gas will get you better throttle response based on advanced timing...

CQRT

26-7 for a mix of in town and highway with 87 . . ..2-3 better mpg with 91 on the highway.

ralphtc

ThumperPup

i run regular fuel in what ever area i am depending on what part of the country and what altitude your at the gas stations have differnt octane ratings for regular and premium
i also run a bottle of techron concentrate from chevron through my gas tank every 6-7 k
i get the fuel injection system cleaned out every 50-60k usually make sure my air filters clean free of depresses and that my oil always looks good keep my tires at 30-31 psi and my 07 ES350 with 212k on it gets me about 28-29 on the highway when im running around 75 MPH highway and drops to around 26.5 - 27 on highway on roads that are 80-85 mph
local city stop and go driving its around 18-20 mpg

garsarno

Recently drove to Cleveland from Scranton, 2011 ES350, average speed 75-85 mph, got a touch over 29 mpg on regular.