I wouldn't touch the O2 sensors, but if you feel they need to be cleaned, sensor-safe cleaner, something like MAF cleaner is all I would ever think about using.

As for the milage, 60 mph is the optimal speed actually, above that drag outweighs the gains in speed, so your OPPORTUNITY COST of gaining one more mph in speed hurts way more at 60+

(been studying my econ today woo hoo!)

And x2 on the ethanol..that stuff burns like crazy..also you have to be careful, alot of states are putting E10 in the pumps for 87 and 89 and they don't have to label it on the pump! You should be using premium anyway though

 

How many of you that have posted your mpg have a roof rack?

 

I do but it stays in the garage until I need it.

 

As far as weight goes, I wouldn't be THAT concerned about the roof rack..I think I saw somewhere that for every 300 lbs you add you lose 1 mpg or something like that. Probably applys more to a smaller vehicle than something like the Disco that is sufficiently powered

If it helps any, I had the roof rack on my Blazer for a while and saw a very minor impact in gas mileage, but when I added the grille guard to the Blazer, I lost about 1 mpg. Probably more weight than drag causing it though.

 

OK, I am a very recent owner of a '99 Disco II. I am coming off of a 1992 BMW525it. (Needed something bigger for camping and mountainbiking.) Anyhow, my wagon lost about 2-3 mpg with using a Yakima bike rack with the wind deflector. Plus it was a ton louder inside the car with the rack. (I went from an average of 22mpg highway to 25/26mph highway). I recently (this month) purchased the Disco II. I immediately changed the oil filter, air filter, fuel filter and added Mobile 1 Synthetic motor oil. I run 91 Octane gas. I am at about 180mi and at 1/2 tank. My last tank was 310mi before the little warning light came on and I drove another 12 miles to get to a gas station. When I filled it up it took 20.8 gallons. The manual says that it has a 24 gallon fuel tank. If I do my math correctly, that first tank was somewhere near 15.4mpg. Not great gas mileage, but not atrocious. (my Disco II currently has 102100miles on it.) Oh yeah, I LOVE THIS TRUCK!!! I'll have pics of the DiscoII up soon enough... Don't get me wrong, my wagon was a very good car and pretty cool to look at and drive, but this LandRover Disco II is something else altogether. To Hell with the mileage, it's a fantastic rig.

[IMG]local://upfiles/9581/EC561F91D4224872A28BDDB57299CC31.jpg[/IMG]

[IMG]local://upfiles/9581/ACAF9E03BE814FAB92BC9E54FC557DF9.jpg[/IMG]

 

The thing with roof racks isint the weight, it is the wind resistance.

 

Weird. I hardly noticed a difference with the rack on the blazer..I guess it makes alot more sense though. That is kinda the main wind line coming off the front end (the windshield/roof line).[:-]

 

could you imagine one of these things in a wind tunnel?
Haha I would love to see that!

 

Roof racks make a big difference.

The better the mpg on the car/truck the bigger the drop in mpg.

I have a VW diesel that gets 48 to 50 mpgon the Hwy and with my roof rack I get 6 to 8 mpg less.
The rack is a Yakima with wind deflector for bikes and kayaks.

 

I did a roof rack mileage comparison with my Jeep Cherokee, when I owned it. (similar aerodynamics (brick on wheels). When I put on my Thule rack I lost about 1mpg, with ski racks on I lost about 1.5, with my "Pod" (closed plastic ski carrier) I lost btwn 3 and 4 mpg on average. Bike ails on top of the bars no noticable diff in mileage, but put a bike up there forget it I'm down 4 mpg or more.

I noticed a 1-2 mpg diff due to drag when I put the ski racks on top of the disco. So I only put the rack on when I'm heading to VT to play inthe snow!