Has anyone ever checked how accurate their average MPG display is? Mine shows about 21 to 21.4 MPG ( I do a lot of highway driving).

The other day, I did accurate manual check on the gas MPG, it was more like 19 MPG.

The in dash display shows a couple of gallons on the high side. With all of the computer stuff on board, there really isn't any reason why it should be inaccurate.

i think it is because it is the total average MPG not just the MPG on this tank or ur current one...same with average speed

it's about + - 2-3 mpg.

Keep in mind the miles to empty does not account for the reserve tank which is around 3 gallons

My average MPG is consistently 2 to 3 miles above my actual average. Every time I fill up I record and then reset the Average MPG on both trip meters. Then, I calculate the actual. The difference between what the truck computer says it got and what it actually got is consistently between 2 and 3 mpg. The truck says it does better than it actually does. I've experimented with all three octane ratings with no apparent effect on mileage performance.

As an aside, even on the open road at about 71 or 72 mph, I've yet to get more than 17 mpg actual. The car only has 8,500 miles on it, and I'm told the mileage performance will get better as time goes on. That improvement, if it occurs, will no doubt be more than negated by rising fuel costs.

i have 40k on mine and still i get 14.5 mpg but im a rough driver

err, im a rough driver also on my rx330, but i can only like 12 mpg on streets. how is the gx getting better gas milage than a smaller suv

break-in???? i kinda did a break-in period with my GX when it was new. i even remember that the first fill-up i had, turned out to be 9mpg!!!

Im pretty sure my break in period is over...considering ive had this car since august 2003 . Even after refueling, i still get horible gas milage, the best at 15. Highway i can get like 22 so thats not a problem.

oh, i what i meant was that maybe the break-in period when it was new wasn't that good or you may have ignored it.

u misunderstood me i get 14.5 HIGHWAY lol

maybe my breakin period wasnt so good, i drove the same way as i did, but i still kept those break in tips in the back of my mind. lol! 14.5 highway isnt that good

that's my city mpg, at least.

really??? hmm

I've been tracking my mpg since day 1 (April, 2004). My new-to-date mpg is 16.371. My new-to-date mpg shown on my GX computer (never been reset), is 18.4.

My guess is that when you're idling and getting zero mpg the computer doesn't take that into account. Just a guess. All I do know is that the computer is off by 2 mpg. YMMV ;-)

Bob

Actually, the computer does take idling into account. If u stop at a red light, the mpg will go down every 10 seconds or so.

I have been averaging around 18 to 19, combination of freeway and city even while trying to be light on the gas pedal.

Yeah!!!! I got a second mortgage to pay for my gas..... Lets do the retard dance!!!!!

The Retard Dance....that's hilarious

I got 18-19 with my 2003 GX and I drive like a bat out of hell. Wait to seee on the new one.