I know the optomismeter on the dash is to be taken with a gram of salt but I liked it anyway. I brought my car home and then later went to pick up a pizza. I didn't think to look when I got there but when I got home it said 1.8 miles 56.8mpg. I'm sure the real number is less but even 20% less would be 45.4mpg and 25% less would be 42.6mpg. I'd take either one for that drive. I hope the optomismeter isn't more than 25% inaccurate.
After the newness wears off, try comparing your trip meter distance against mile markers or GPS for 100 miles. I found the distance error to track with the MPG error per tank. Due to an unfortunate puncture, we replaced the original tires with ones whose REVs/mile fixed the indicate miles and speed. It also cured the Indicated MPG vs tank error. Bob Wilson
You may have mentioned this elsewhere earlier, but if you did, I missed. Care to repeat which brand was original and what you replaced them with? With 35k miles already on the OEM Goodyear tires, I'm expecting to need tires soon after our next trip.
I am running Yokohamas because the Sumotomo was changed and no longer available at 51 psi. But the method is more important. Tire Rack posts the REVs/mile so I picked the 15" Yoko whose slower turning corrected the odometer error. That also fixed the tripmeter indicated MPG vs tank measured error. Now my GPS and indicated speeds are all but identical. Bob Wilson
Hah. Tanked up last night at my favourite gas station: a Chevron at west end of Barnet highway. Noted odometer, reset trip meter, and headed east. The next km are two are a relentless downgrade, and the speed limit is a modest 80 kmh. After the hwy: a lot of reasonably level streets at 50 kmh limit. And this is late evening, light traffic. Engine fully warmed, babying it, using a lotta cruise, rolled into the garage at "displayed" 2.7 litres per 100 km. Which is just nuts: translates to 87 mpg. As mentioned above, that'll be high by around 7%, and more importantly: has about as much hope of longevity as a snowball in heck. But as you say it sure feels good.
If mine is also 7% that would mean about 52.8 for a 1.8 mile drive on an engine that was luke warm at best. I'll take that.
