would this have been the same riding conditions on both the xp and 800?

so 100 miles on a 4.1 gallon tank on the 800

110 miles on the 5.3 gallon tank of the xp...

thats
~24 mpg on the 800
~21mpg on the xp.

lets hear some more results from people who have owned both or either one

 

More flat with the SP800 & summer weather. The 850XP was more rain & cold weather and turns. The temp was around 37 out at the time w/ the XP. The XP had around 100 + miles when I started the trip on it while the SP800 had around 700 miles at the start of the trip. I rode the XP harder because it was much more comfortable with my bad back vs the SP800. Hope this helps?

 

well i'll throw in my .02 since i have owned a 500 and 450 and 2 800's. the best i've seen on my 800 was 16 mpg w/ stock tires and the worst was 8 mpg. the 45o would easily hit 20 mpg +. if your claiming getting close to 20 mpg on an 800(which has a 4.13 gal tank) you are driving it extremly easy and very steady on the throttle w. mostly stock set up. i find it hard to understand how you guys w/ 4 gal tanks can get 100 miles out of 800. i must have been very hard on both my 800's then lol.

 

Not sure if it matters or not but when we ride we start at a full tank and run them to empty? Average speed of 30-35 mph. I just know my own experience and really do not care how many mpg the quads get to say it in a nice way. Its a atv & not a daily commuter!!!! All that matters to me is that I can get from A to B with fuel and if not pull out a fuel pack and fill up! ;-) Now lets move on!!

 

It matters to some, but not most. I agree with you. However, if you're Mongrol and you head up into the 11,000' peaks in the middle of January, 40 miles from the nearest human being, in snow that would swallow a tractor trailer....it then matters.

 

It really isn't a good idea to run an EFI machine out out of fuel,fuel cools the pump,starving the pump of fuel is not a good thing....if you haven't heard that just google it...
I doubt most people let their machines completely run out before refilling. I check mileage by topping off and then measureing how much it takes to re-top. If you really want to know how far it will go I wouldn't run it dry but once on purpose.
Average speed of 30-35 is higher than most probably average and would likely result in more MPG..there are so many factors that quoting MPG on an ATV is sketchy at best unless the different machines are ridden on the same trails,same speeds same everything...
I agree,I don't much care about mileage but many do and I must say I am happy about getting 22+ out of my current ride when riding 2up on the faster trails....better to have fuel and not need it than the other way around.
As for moving on...well I didn't start the thread so I wouldn't discount the importance of fuel economy and tell everyone to just move on...but that is just me.


BTW my '08 800 woudn't get a 100 miles per tank unless it was on a trailer,getting towed or it was all down hill lol.

 

True Funride that's why we carry extra fuel. Just in case of the unknown its always the smart thing to be prepared for the unknown. Safety first.

 

HO, not all parts of America are the same I agree. I remember when I went to Harlan KY on one of my many tirps last year & it was a completely different type of riding experience. Mostly rocks and climbing. We would do 50 miles i a day and be tired vs here in the Midwest where we ride 200+ miles in one day with no issues. Come up to my neck of the woods and you will see and feel the difference.

 

neither grizzly 700 lol friend has the 850 and although it pains me it work very well in the mud hills trails and is a great machine .ps ,my wife says its easy to pull out of anything with her king quad 500lol.

 

nope.. i definitely dont drive it easy.. lol heavy 27" itp 589's and k&n filter. stock otherwise.

one of the trips i specifically measured mpg because there were gas pumps everywhere... stendori you've probably ridden the trail from newport to dover ITS 85 i think it is. I filled it up in newport and filled it up again when i got back from dover same pump, same day. Was 3.1 gallons and the trip was 28 miles each way approx 64 miles. Now this trip was on a monday afternoon in the fall. no one anywhere on the trails, saw only one atv all day. Trust me i was romping on the gas. WOT off every stop sign... I was very surprized to see the 20+ mpg... at one point on the way back from dover i was avging on the gps 40mph until the dips in the trail got too severe (the avg speed includes stop signs and everything...). Overall i think my avg gps speed that day was in the mid to high 20's by the end (that trail has a lot of dips and dives in it). I dunno, it is what it is i guess.

Same trail on another day with a group of 5 people the 500 efi my friend has used 2.9 gallons on the same trail. I used 3.3 gallons but was on my 94 400sportsman 2 stroke with leaky overflow lol. that day was an easy ride because of the group.

The type of terrain you ride is one of the biggest factors, no arguing that.. if your riding slow techincal trails gas mileage is going to suffer big time. Thats why when you compare machines it has the be the same rider and terrain/trails.

They're both fuel injected and *SHOULD* both be running near stoich 14.7:1 (except under power enrichment). 2 machines with somewhat close displacement and weight. Unless the 800 comes with a fat fuel curve they should be very close. Maybe some of you guys on the 800's getting poor mileage should invest in a tuner and a wideband oxygen sensor (tells you your exact air fuel ratio, around 3-400 dollars). Actually this spring im gonna take the wideband out of my ws6 trans am and install it in my 800 just to see what its running for airfuel ratios.

Ive tuned my 600 horsepower trans am fuel curve so well that it still gets 18 mpg city driving in open loop. if anyone here flashes pcms and does tuning they'll know what i mean.