Thanks for the help! Hope I didn't get the thread too off topic.
Here's a snippet from an article in Hot Rod Magazine on Wideband readings with different fuels
"Caution! What most A/F ratio devices actually measure is really the amount of residual oxygen (for lean mixtures) or unburned hydrocarbons (for rich mixtures) contained in the exhaust gas. Reflecting this, many consumer-level wideband sensors read out in Lambda (λ) values instead of the A/F ratio. Regardless of the fuel or fuel blend, the λ value at the correct stoichiometric A/F ratio for any fuel or fuel blend is always equal to 1.00—therefore with rich mixtures λ is less than 1.00; for lean mixtures λ is greater than 1.00."
Read more: http://www.hotrod.com/how-to/engine/...#ixzz3lfRacaOR
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