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Old 08-01-2020, 12:56 AM   #141 (permalink)
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Da Vinci - '91 Geo Metro Spaceship
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Just did a 195 mile road trip in the metro. If my gas gauge is linear, I got approximately 55mpg, and I was hauling ass, between 75 and 95mph. Really hard to keep speed down because it was so aerodynamic. Easily hit 100mph, felt fine. Rock solid. Imagine how much efficiency it’ll get once I rebuild this clapped out motor.

I regret to say I just realized I cannot keep accurate track of my fuel economy besides long known route trips like this one. The speedometer gear is from the stock transmission, so it reads low. As a result I cannot use the odometer or tripometer to accurately track MPG. I’ll try to get a new speedo gear in before I pull the motor for the rebuild so that I can accurately track my efficiency at that point.


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Old 08-01-2020, 01:55 AM   #142 (permalink)
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The speedometer gear is from the stock transmission, so it reads low.
My Superbeetle is opposite. The speedometer reads off the left front wheel with a 50-series tire and it's off by ~10%.

Errand runs are hard, but a run up the valley with paper receipts and mileage from Google maps [when I used Google ] was doable.
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Old 08-01-2020, 02:54 PM   #143 (permalink)
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Was told by a Geo forum member that the fuel gauge is absolutely not linear. Disregard previous MPG. I'll put gas in once it looks like I'm about to run out and attempt to get an MPG from that with the distances I know I have driven since. Number will be extremely approximate. After this fill up I will start using GPS for mileage tracking.
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Old 08-03-2020, 12:04 AM   #144 (permalink)
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Da Vinci - '91 Geo Metro Spaceship
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Okay, I have a real fuel economy number finally. In Approximately 430 miles (30 miles around town driving, 400 highway 90% of driving was with AC on, about an hour and a half idling and revving to help diagnose the fast idle issue and/or run AC to cool the car.). In that distance, the car consumed 8.913 gallons of 87 octane gasoline. Rounding that up to nine for the benefit of the doubt on that idle time, I get a real world fuel economy of 47.777r miles per gallon. Not bad at all considering how clapped the motor is.

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Old 08-03-2020, 12:11 AM   #145 (permalink)
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Nowhere to go but up?
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Old 08-03-2020, 12:44 AM   #146 (permalink)
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Originally Posted by freebeard View Post
Nowhere to go but up?
Absolutely, this is almost a worst case scenario for highway mpg. The motor has half the compression it should, I was going fast, air conditioning on, quite a few hills, plus lots and lots of idling in between.
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Old 08-03-2020, 02:59 AM   #147 (permalink)
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Aerocivic gets 100mpg, so a reasonable goal would be to double/halve the baseline.
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Old 08-03-2020, 11:07 PM   #148 (permalink)
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With everything you have going on there that's some pretty good mileage numbers. That car has a ton of potential once it's fixed up.
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Old 08-04-2020, 03:47 AM   #149 (permalink)
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Can you calculate how accurate your odometer is based on mile markers?
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Old 08-04-2020, 09:28 AM   #150 (permalink)
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Quote:
Originally Posted by Xist View Post
Can you calculate how accurate your odometer is based on mile markers?
Kinda......the start/stop timing is critical so you need many to determine how much accuracy is off, BUT, short hand, it will give you an estimate of which way and roughly how much.

Use the onboard stuff in your phone

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