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I haven't been driving much over the last couple months. I filled-up the other day and registered my worst tank MPG ever - 49.3 per FCD, 48.4 per fill-up calculation... Kind of curious what others' worst tank MPGs look like?.

What's funny is, even 49 mpg is way better than what I used to get in my Miata, for example. I used to be happy when I could eek-out just a bit over 30 mpg on highway trips in that car.

What's interesting is this low tank mpg reflects a few key things:
1) very short trips, like a couple miles, from cold start
2) cold weather (like in the 30s F)
3) low tire pressure

This last one was a real shocker. I kind of thought one of my rear tires looked a bit low, but never got around to checking it. I checked it the other day and it had only 15 psi. The thing is, I actually drove about 120 highway miles on that low tire and still got about 65 mpg... Thought I'd post this, too, as just a heads-up: it's not that easy to tell that the tire pressure is low if it happens from a slow leak, and by just the occasional casual visual inspection. On the other hand, after airing the tire up (and the others, they were a bit low), it's a very noticeable difference...

So, low tank MPG? What's yours?
 

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Probably when I very first got the car, I think I was getting 45-48 for a few tanks, before I learned how to drive it.

It's funny to me that my expectations of MPG have gone way up - if I get below 50mpg on a trip nowadays, I think "yeesh, that's terrible." But it's still better than most all other cars, 50mpg is actually quite a lot!

If I get below 40mpg I know something's wrong with the car. That's how good the Insight is. :)
 

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I've never gotten below 40 MPG (2002 CVT with over 200,000 miles,) but I can remember a time when I had never gotten below 50 MPG! Of course the first few years were the best, hovering around 60 MPG's, but that was when I drove in the sweet MPH range all the time (45-55 MPH.) Lately, the 45-50 MPG mark seems to elude me.:confused:
 

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40.08 MPG over a tank of gas as measured by pump/odometer.

It was 100% highway miles, freezing temperature, trying to go fast, loaded down with about 200lbs of stuff, and I had a damaged aero panel on the bottom of the car for half the tank. (I stopped and fixed it about 330 km into the tank, but I suspect it was damaged before I was on this tank.)

My best for comparison was 78.34 mpg.

Also, 40.08 still blows my old car out of the water.
 

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Discussion Starter #5 (Edited)
Yeah, that's part of the feeling that compelled me to start a thread: my worst tank mpg, under truly awful conditions, is still better than like 99% of the cars on the road, probably under the best conditions...

For comparison, I've averaged about 65 mpg since I got the car about 5 years ago...
 

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61.77 mpg is my lowest on Y2K (Silver).
88.1 is my best tank.

I have a new-to-me Red Insight, but I'm still working on some issues. Brakes are dragging, tires are wrong size, bumper sensor is missing. Once I get these taken care of I'll start logging MPGs on fuelly. Currently it has been running mid to upper 50's per tank.
 

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I don't think I have gotten under 50 in over 2 years now. October 2014 I fueled up for 48mpg. Since then, my worst tank was 52, and I idled for 6 hours at work that tank per my notes.
 

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gotten close but never below 50mpg, even with the air conditioner on, doing a lot of city driving with a failing IMA and no autostop.
 

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58.5 mpg for a tank, on a road trip with constant wind. Tumbleweeds were airborne across 4 lanes plus the median, and it was a fight to keep the car in one lane with frequent gusts of about 50 mph/43 knots. After tiring of fighting the wind for several hours, I pulled off the road next to a gas station for a nap and the wind rocked the car the rest of the night.
 

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I don't think I have gotten under 50 in over 2 years now. October 2014 I fueled up for 48mpg. Since then, my worst tank was 52, and I idled for 6 hours at work that tank per my notes.
That 48 tank was probably when I filled your tank, you were going like 90 to Scott's place. I had the death grip on anything I could get a hold of. lol

I don't think I have ever gone below 62 with a bad battery.
 

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~40mpg over 500 miles mixed 3/8hwy 5/8ths city.
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TRIP FCD: 5.8L/100km ~41mpg over 800km ~500miles.
HWY" ~300km hwy ~180miles; CITY: ~500 city,~320miles
Continental Sub Arctic Winter cold conditions; short trips mostly <5miles ; stock tires, [some unavoidable wheelspin/->wear]; A/C ON Full, 32C [top] setting to dry windshield air; 'ELD' ~48-58 varies: headlights etc, blower motors, IMA fan on 'F', heated seats,; BCM warming pack 'Bat'; dense air to move through; low IAT; typically slow traffic; idling to keep cabin warm for passenger.
Above # in spite of warm air intake, full radiator block, stock tires, nb. slippage.
Autostop is functional only after about a half hour driving when 'Ect' temp is over about 68C iirc.
 

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That 48 tank was probably when I filled your tank, you were going like 90 to Scott's place. I had the death grip on anything I could get a hold of. lol

I don't think I have ever gone below 62 with a bad battery.
LOL. I remember that now.
 

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I think the worst tank I've ever had was around 48mpg. Lately I've only been hitting 50ish per tank, but it's nearly all 70mph highway, with a passenger, and new heavy snow tires.
 

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This is one competition I am sure I could win if I wanted to.

60 per cent bigger injectors than stock, able to run whatever air/fuel ratios I want, turbo at up to 15 psi.

That said, I've never got a tank worse than about 5.5 litres/100km (43 US mpg).
 

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My worst manually calculated tank full yielded 56.72 MPG average.

I always run 87 octane (and when going cross country have to settle for 85). My driving is roughly 75% highway vs. 25% city.

On the flip side, the best calculated tank full yielded 77.7 MPG and that was nearly pure highway driving at ~55 mph over a single day in very nice weather during a road trip.

The car is all stock with RE92s, at the time pumped at ~40psi
I have since upped the pressure to ~50psi and I am seeing a slight reduction in fuel consumption over the same cold winter months as last year. It has historically dipped significantly during winter months, which is normal.
 

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Worst MPG was about 47 or so. But I only get that when I do a "drive it like when you stole it" on the Autobahn at 85-90 mph in 4th gear. My car seems to like that, LB seems to work better after that cure. I am doing that once a month or so.
 

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