Probably a dumb question. The reason I ask is that we have two gassers plus the D/A and is sure would be much easier to buy a case of one product for all.

If HEET is what I think it is, definitely no way! Isn't that the stuff to prevent fuel line freeze-up? If so, it is alcohol and will ruin the fuel system because of no lubricity. Diesels and alcohol, just say NO!

Don't know if you will find anything to work for the gassers and the diesel as well. Kepp heat around for the gassers and get some Stanadyne for the diesel. It is recommended by GM and is a very good product. It appears to cure some isssues with the DMAX, in regards to fuel creating wierd noises, smoke and surging. Nothing alcohol based should be placed into your tank as it could cause some extensive/expensive damage to your fuel system.

No methanol in ANY engine not designed to run on it. No alcohol in diesel. If you run additive in gasoline, I'd suggest Iso Heet...