Jlacck

I've been meaning to ask this question for a while. I noticed there are 3 gas mileage readings in the multi information display on the 98 lexus.

Tank average MPG
Current average MPG
Average MPG

My question is, which reading is the most accurate in terms of the actual MPG that I'm getting in my car?

I would imagine that tank average seems to be the best indicator. However, current MPG seems all over the place depending on whats actually taking place (I've seen it go all the up to 99.9 MPG on declines and as low as 12 or so when driving up hills.

Can anyone clarify which one I should be paying more attention to?


D

RugbyDad

Tank average is mpg since you last refueled. Current mpg is what the car is currently getting for mpg (instant mpg reading). Average mpg is mpg since the ecu was reset or since you reset the counters back to zero.

They're all accurate, they're just measured across different periods of time. All that being said, tank average is the one most pay attention to and probably most relevant day to day.

Jlacck

Yea the tank average is actually the one I pay the most attention to now. It used to be current MPG but I couldn't get a good read on what I'm getting with all the driving I do.

timmy0tool

iTrader: (7)

you can also calculate your own MPG. the way i do it is to fill up the tank to full, reset the trip meter, drive until almost empty, then take the miles driven on the trip meter and divide that with how many gallons of gas it took to refill the tank to full. that would be the tank average which is most commonly referenced.