ebhudgens! do you have a roof rack? regular tires? which GPS do you have? good input.

I've been using 91 octane and been getting a little over 15 mpg. However, I do have mud tires on that usually lower mpg around one mile per gallon.

I used 89 on a 600 mile trip I shortly after noticed that my gas mileage was getting worse so I now have been using premium and my mileage and feel is better. I shop around for fuel to find the best deal on premium and its not so bad. Also I read an article on the ignition system and it was all about the differences in performance with premium fuel in the FJ. I will try to find the article and follow up.

I have had my FJ for 2 months now and running 89 octane, averaging 18.4 miles per gallon with mixed driving. I just got back from a road trip to Misouri and found on the way back my avg was 19.7. My guess is this is due to them not having to use refourmulated gas? Like I have to use in Wisconsin. Any thoughts?

My 2007 FJ (6 spd. manual) has been running on 87 octane since January. <The dealer told me 87 would be fine> I've only put 4,500 miles on her and have begun to notice a dark black carbon build-up on the tail pipe. Wondering if this is due to the cheap gas? Will pipe in premium next time around and see if I notice a difference in mpg or driving quality.

I also decided to go Mobil 1 5w30 synthetic for lasting performance on my vehicle. Anyone think this was a stupid move? I figure, every 5,000+ miles or so...buy the Mobil 1 at Costco for $28 per 6 quarts. Pay $15 labor for the oil change... still beats the cheap stuff which I'd be changing every 3-4K miles.

Any luck on that article? A friend of mine said they read the same thing. I'm interested in giving it a quick read...

Nope, I think you're pretty smart.

If you'll send in an oil sample to some place like Blackstone labs (There's a thread here.) you'll be able to find out how long you can run the Mobil1 between changes (After the warranty of coarse) I discovered on my 04 Nissan Titan that I could actually go 13,000 miles between changes. Pretty cool when you drive over 3000 miles a month.

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Hello. I seem to notice better mileage with the premium (92-93) gas then I do with 87 or 89 octane. Of course, I might be telling myself I'm getting better mileage because it costs more. But I think it does.

Has anybody tried the unichip to improve fuel mileage

Just getting back on the gasoline issue. I've started using 89 oct. and I'm getting at least 18mpg, compared to the 15 I was getting months earlier with 93 oct. This is probably due to the detergents they put in winter gas. It also seems that I havn't lost any performance with the lower oct. and there's no pinging in the motor. I don't plan on using high octane anymore unless possibly in the winter.