Simple request for you TJ guys regarding gas mileage
Not 100% sure if this is the right place but i'll post it here
We all know TJs do not get great mileage. However i have found reports that gas with ethanol added will not "agree" as well with the 4.0 engine. So if some of you could just use a few tanks of gas with ethanol and a few without and compare the mileage we might able able to find out if there is any truth to it.
http://pure-gas.org has a listing of gas station that have ethanol free pumps, its not 100% accurate so you might have to double check yourself to see if it is ethanol free.
Please help me figure out if there is any truth to this is emperical date from a number of sources rather then just hearsay.
This is a log of fill ups and the type of gas either 87 ethanol or rec fuel. The resulting mileage for the fuel type shows in the next fill up.
I think it is obvious from this data that there is more energy per unit volume in the rec fuel.
While the MPGs were better the Miles/$ were worse lol. I also wonder about engine life between the two fuels while you are at it.
In Illinois we don't have the option to buy non ethanol fuel. E10 was here in 80's and has been ever since. I should say that yes, you could buy racing fuel at some obscure station at an outrageous price that wouldn't have ethanol.
Anyways...The engine life seems to be fine, 200,000 miles is obtainable on many vehicles and could be surpassed.
I must be reading it wrong. It looks like your worst mileage (13.97) was on the rec fuel and the best (16.73) was on the ethanol fuel. And the rest of them aren't that far apart.
The line that is marked rec fuel is the kind of fuel purchased that day. The mileage for that purchase shows at the next fill up. That is the next line.
Originally Posted by Eckoh
prices vairy place to place, where i am the prices are the same just the "brand" is different.
Where I am the price for 'real gas' is much higher that for the ethanol blend. If it was the same I'd never buy ethanol. The pump is labeled "for recreational use only' but I figure if my TJ isn't recreation what the hell is! Sure as heck isn't my lawn mower.
Non-ethanol in my city is only available at one station I have found. They usually only have it available in the mid-grade octane, and it is about 50 cents more per gallon than regular around here. I have tried a couple of tankfuls, but have not seen a noticeable improvement in mpg.