Hi Bati,

We don't have enough tanks of gas yet for me to give you a really accurate answer. We appear to be getting between 36-38 mpg. We used high octane on our first tank and Chevron regular on our second. Our next tank will be Shell regular.

The tank holds 20 gallons, but I'm not sure when the fill up light comes on.

I'm on about 600 miles on this tank and still not ready to refill.

The Altima hybrid definitely has "gusto" compared to other hybrids we drove. I think that is why some people get lower MPG. There can be a temptation to drive it more like a sports car than like a hybrid. We try to drive conservatively.