Thread: random thought on big tires
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Old Wed, May 19th, 2010, 07:46 PM
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If the engine has to work too hard to maintain velocity, then your fuel economy goes right in the toilet.

I had a 1984 Bronco II with the 2.8L V6 and manual 5-speed transmission. Because of trouble with the engine control system, I put in a normal carburetor and a duraspark distributor and ignition module. The thing was a gutless turd no matter what, but it would consistently get 2 MPG better in 4th gear than 5th gear....and all of the miles were highway miles at 70-75 MPH. No in-town driving.

It's all about engine efficiency range and load.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.