I wouldn't recommend running the engine out of gas. Gas is what cools the fuel pump and running out of fuel not only can pull some debris into the fuel system, it IS tough on the pump.

 

No your correct i have the smaller tank in my 92 police package . Doesnt bother me, never really drove it long enough to run out of gas

 

With a 3" lift and 31's I'm roughly getting 250-260 per tank in the city with a little Interstate driving mixed in. I have gotten close to 315 miles per tank if its a Interstate/highway only trip.

 

Ok now I'm confused... Bigger tire radius would mean that the odometer reads more miles than actually driven, correct? So if it SAYS I have driven 100 miles, have I really only driven 80ish? That would mean I'm actually getting even LESS mileage than calculated?

 

Yep me too... typically I average 23mpg using Non Ethanol gas. I got 20mpg with E10. Slow and easy, keep RPMs low, speeds low, and I don't even use the highway.

 

I only get bout 175 per tank. 3inch lift and 31's

 

Holy crap!! If you have the 20 gallon yank that's like 9mpg!

 

Stock 2000 XJ with 30x9.5 bfg ats i get 270-290 miles when i get to E mixed city/highway, I constantly drive 52mph in town and 73mph on the highway(Dont ask me how i know) I could probably get more if i turned off a/c and drove at 65mph.

 

No, larger tires will mean that the odometer will read less miles than actually driven. The speedometer gear is in the transfer case, and is correct at say a 225/75rx15 this tire is 28.3 inches tall and the revs per mile are 735.
Now take a 265/75rx15 this tire is 30.7 inches tall and the revs per mile are 678.
Since both tires are turning the same revolutions at a speedometer reading of 60 mph. The 265/75rx15 would be going farther because it takes less revs to cover a mile.

 

I get bout 225 miles on a tank with my stock 96.

 

280-300/tank with 30's, 3.55's, full size spare+tools and recovery gear in back.

 

I gotta ask.

Everyone have the same size tank?

 

That's a thinker...

 

i get about 240 miles a tank if its mostly highway and about 190-200 when its all city.... im stock, 235s, dyno max cat back exhaust and a roof rack with 4 lights on it and a shovel but no spare. honestly, the racks lights and shovel had almost no change on the mpgs. i think im going to change the spark plugs, wires, caps, rotor ect. and see if that will get some more mpgs. id love to get 220 city and 260 highway. oh and when i fill up i put in about 16 gallons everytime and thats from almost dead empty, the needle is bellow the "zero" mark

 

Yes, now that makes MUCH more sense. bigger circumfrence=fewer revolutions per given distance. How did you figure the revs per mile?

Oh, and how do you adjust for this when calculating mpg? Simply multiply the logged miles by a certain percentage?