Can you use the HTML code wherever you're planning to use it? You can change the size in the code- ex:
Copied from your Fuelly profile-
Code:
png" width="115" height="40" alt="Fuelly" title="Share and compare MPG at Fuelly" border="0" style="border:solid #ccc 1px;padding:4px;background:#fff;"/></a>
Edited-
Code:
png" width="95" height="40" alt="Fuelly" title="Share and compare MPG at Fuelly" border="0" style="border:solid #ccc 1px;padding:1px;background:#fff;"/></a>
Which will produce an image that's 99x44px.
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