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Regular Plus vs Premium Fuel - Which is really less expensive?

15 messages,  Last post on Jul 15, 2008 at 6:01 PM

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What is this discussion about? Toyota FJ Cruiser, SUV

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#7 of 15 Gas Mileage! by oy812 Apr 01, 2008 (8:20 pm)
I just recently bought a 2007 FJ Cruiser and am getting only about 200 miles to the tank. I live at the top of Maine where the average speed is 50 miles an hour. I have tried both high and low octane fuel and it doesn't really seem to make a difference in how long my tank of gas lasts. That is about 10.5 miles per gallon, or 1 fill-up per week. I am just wondering if there might be something wrong with my FJ. It has 12000 miles on it and the TRD rims with BF GoodWrench T/A tires. Looking for some answers if anyone can help me out. Replies to this message: jcosta (Apr 05, 2008 10:06 am) mnfjhunter (Jun 13, 2008 10:53 am) tnbluefj (Jul 03, 2008 11:24 am) sparklemahn (Jul 15, 2008 6:01 pm)
#8 of 15 Re: check out the [steve_] by oy812 Apr 01, 2008 (9:46 pm)
Replying to: steve_ (Mar 29, 2008 5:52 pm) This was an EXCELLENT review of high and low octane affects fuel economy!
#9 of 15 Re: check out the [steve_] by mwhunter1 Apr 02, 2008 (6:18 pm)
Replying to: steve_ (Mar 29, 2008 5:52 pm) I was just reading the Owner's Manual for the 2008 FJ, and at least in 'that' manual, it says the required fuel for the FJ is 91 octane.
#10 of 15 Re: Gas Mileage! [oy812] by jcosta Apr 05, 2008 (10:06 am)
Replying to: oy812 (Apr 01, 2008 8:20 pm) I have a 07 FJ auto TRD and have only run three tanks of fuel two of which to report on. I have registered on www.fueleconomy.gov. First tank $45.15 13.18 gal 253 miles for 19.2 MPG. Second tank was $45.50 14.31 gal 278 miles for 19.42 MPG. I run mostly back streets 45 mph tops. When I run on the highway 70 to 75 mph. Reg gas 87 or 89
#11 of 15 Statistic Outliers by fhrabetin Apr 05, 2008 (10:28 am)
Keep in mind that this vehicle has an "S" shaped fill tube which confounds most auto fill pumps in Oregon, premature click-off. A very slow fill can help this. When I top off I can add up to 3 gallons, +/- 0.5 gallons. Ambient air, temp of vehicle gas tank, how cool is the gas storage tank can all confound this. I'm not sure I've covered all the variables. Replies to this message: steve_ (Apr 05, 2008 11:15 am)
#12 of 15 Re: Statistic Outliers [fhrabetin] by steve_ HOST Apr 05, 2008 (11:15 am)
Replying to: fhrabetin (Apr 05, 2008 10:28 am) They let you pump your own gas in Oregon now?
#13 of 15 Re: Gas Mileage! [oy812] by mnfjhunter Jun 13, 2008 (10:53 am)
Replying to: oy812 (Apr 01, 2008 8:20 pm) I own a 2007 Fj with manual trans. I use 87 octane fuel and average just under 15mpg. I never gained more than 1 mpg ever while using the 91 octane fuel. In the winter my mileage was only 12-13mpg. I have the TRD Rims with BFGoodrich T/A tires on it as well. Roof rack,skid plate, the works. Everything an TRD edition would have other than the paint and exhaust. These reports of people getting over 20mpg is B.S. I think. I have to fuel up after only 250 miles tops. I could squeeze another 20 miles, but I don't want to be stranded on the side of the road. I now have 25,500 miles on mine. It drives great in the Minnesota winters. Replies to this message: tnbluefj (Jul 03, 2008 11:24 am) sparklemahn (Jul 15, 2008 6:01 pm)
#14 of 15 Re: Gas Mileage! [mnfjhunter] by tnbluefj Jul 03, 2008 (11:24 am)
Replying to: mnfjhunter (Jun 13, 2008 10:53 am) Hello,  New to this forum. Just wanted to say I have an '07 FJ, bought in Feb of '07 - I now have almost 25,000 miles. Own a home in TN and in FL so do a lot of Interstate driving. I only use REGULAR fuel and always get over 20 mpg hwy. I just returned to FL from 3 weeks in TN and my best mpg was 24.77. My average with 5 tanks was 22.28. I keep my tires aired up, air filter is a K&N, no luggage rack, no other mods. I usually drive the posted speed. On I-75 will drive 72-73 mph., over that and mpg will drop considerably. I do not quickly take off from stops and try to be careful with accelerating into traffic. I have tried several tanks of premium and noticed no difference in my mpg. So I know you can get decent mileage per tank, but you just have to pay attention to your driving habits. And if it makes any difference, I am a 52 yr old female. Replies to this message: sparklemahn (Jul 15, 2008 6:01 pm)
#15 of 15 Re: Gas Mileage! [tnbluefj] by sparklemahn Jul 15, 2008 (6:01 pm)
Replying to: tnbluefj (Jul 03, 2008 11:24 am) Just picked up a brand new 2008 FJ 6 speed stick. The extended owners manual specified 91 octane gas. Mobil has 93 and 89, so if I fill up with the same amount of fuel but switch off between 89 and 93 octane, I will average 91 octane. If the manufacturer calls for 91, you should use 91! Do not complain later if you have engine trouble, ok?

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