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Old 09-14-2014, 12:16 PM   #2 (permalink)
oldtamiyaphile
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Join Date: May 2009
Location: Australia
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UFI - '12 Fiat 500 Twinair
Team Turbocharged!
90 day: 40.3 mpg (US)

Jeep - '05 Jeep Wrangler Renegade
90 day: 18.09 mpg (US)

R32 - '89 Nissan Skyline

STiG - '16 Renault Trafic 140dCi Energy
90 day: 30.12 mpg (US)

Prius - '05 Toyota Prius
Team Toyota
90 day: 50.25 mpg (US)

Premodded - '49 Ford Freighter
90 day: 13.48 mpg (US)

F-117 - '10 Proton Arena GLSi
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Mitsubishi
90 day: 37.82 mpg (US)

Ralica - '85 Toyota Celica ST
90 day: 25.23 mpg (US)

Sx4 - '07 Suzuki Sx4
90 day: 32.21 mpg (US)

F-117 (2) - '03 Citroen Xsara VTS
90 day: 30.06 mpg (US)
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Quote:
Originally Posted by eco-jeeper View Post
- Tires were oversized from stock 215mm (27.7 inches tall) to 31 inches
- Gears were not reset, so the Jeep is traveling faster for the same engine speed (speedo reads 60, actually moving 65, from calculations and empirical tests)
Have you checked it against GPS? I have basically the same setup and the bigger tyres have just corrected the usual speedo under-reading, now reads 101 at a GPS 100.

Note too that the odometer is calibrated differently from the speedo. From the factory a speedo typically reads +5% while the odo reads accurately usually within +/-1%.
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