I have an aftermarket fuel tank (Titan fuel tank) on my 3500HD Silverado. Total capacity is 234 litres. My last fuel up was 160litres. Fuelly won't let me add the fill-up as the interface says 'too large a volume for your truck'. I emails Fuelly.com, no response. Any chance of getting a change made so that trucks with larger tanks can continue to use fuelly.com ?
Sorry, we're not going to make that change so I don't think Fuelly is going to work for you. We need to have some data limits so people can't enter completely bogus data, and all of our assumptions are based on a standard family car down to a motorcycle.
You could definitely build an application that would handle different sizes, it's just not on our short term or long term to-do list. I think down the road it might be nice to track any type of vehicle with any tank size—we just don't have the resources to do it right now.
Sorry about the slow response to your email. We're just getting through a holiday weekend here, and we're not as quick with responses as we should have been.